| Base | Representation |
|---|---|
| bin | 100100000110001… |
| … | …1100100011001100 |
| 3 | 10010102010110112020 |
| 4 | 1020030130203030 |
| 5 | 4440033102340 |
| 6 | 320104410140 |
| 7 | 42005135055 |
| oct | 11014344314 |
| 9 | 3112113466 |
| 10 | 1211222220 |
| 11 | 5717811aa |
| 12 | 299776950 |
| 13 | 163c23450 |
| 14 | b6c1172c |
| 15 | 715059d0 |
| hex | 4831c8cc |
1211222220 has 96 divisors (see below), whose sum is σ = 3668790720. Its totient is φ = 296801280.
The previous prime is 1211222213. The next prime is 1211222227. The reversal of 1211222220 is 222221121.
It is an interprime number because it is at equal distance from previous prime (1211222213) and next prime (1211222227).
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1211222220.
It is not an unprimeable number, because it can be changed into a prime (1211222227) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175230 + ... + 182010.
It is an arithmetic number, because the mean of its divisors is an integer number (38216570).
Almost surely, 21211222220 is an apocalyptic number.
1211222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1211222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834395360).
1211222220 is an abundant number, since it is smaller than the sum of its proper divisors (2457568500).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1211222220 is a wasteful number, since it uses less digits than its factorization.
1211222220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7035 (or 7033 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 15.
The square root of 1211222220 is about 34802.6180049720. The cubic root of 1211222220 is about 1065.9609040101.
Adding to 1211222220 its reverse (222221121), we get a palindrome (1433443341).
The spelling of 1211222220 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty".
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