| Base | Representation |
|---|---|
| bin | 1100010010110100111… |
| … | …0100110110100000110 |
| 3 | 202012011202000112002100 |
| 4 | 3010231032212310012 |
| 5 | 11430030310414342 |
| 6 | 241010214252530 |
| 7 | 21155015042211 |
| oct | 3045516466406 |
| 9 | 665152015070 |
| 10 | 211212201222 |
| 11 | 81635865a00 |
| 12 | 34b26657146 |
| 13 | 16bc01b3579 |
| 14 | a31922c778 |
| 15 | 576297ce4c |
| hex | 312d3a6d06 |
211212201222 has 144 divisors (see below), whose sum is σ = 513526444704. Its totient is φ = 62675078400.
The previous prime is 211212201139. The next prime is 211212201229. The reversal of 211212201222 is 222102212112.
It is a happy number.
211212201222 is a `hidden beast` number, since 211 + 212 + 20 + 1 + 222 = 666.
It is a super-2 number, since 2×2112122012222 (a number of 23 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 211212201195 and 211212201204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (211212201229) by changing a digit.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 30952503 + ... + 30959325.
It is an arithmetic number, because the mean of its divisors is an integer number (3566155866).
Almost surely, 2211212201222 is an apocalyptic number.
211212201222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 211212201222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256763222352).
211212201222 is an abundant number, since it is smaller than the sum of its proper divisors (302314243482).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
211212201222 is a wasteful number, since it uses less digits than its factorization.
211212201222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7147 (or 7133 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 18.
Adding to 211212201222 its reverse (222102212112), we get a palindrome (433314413334).
The spelling of 211212201222 in words is "two hundred eleven billion, two hundred twelve million, two hundred one thousand, two hundred twenty-two".
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