| Base | Representation |
|---|---|
| bin | 100100011001011… |
| … | …1100100111010110 |
| 3 | 10011010010020021000 |
| 4 | 1020302330213112 |
| 5 | 10000124040110 |
| 6 | 321105004130 |
| 7 | 42160002135 |
| oct | 11062744726 |
| 9 | 3133106230 |
| 10 | 1221315030 |
| 11 | 577445071 |
| 12 | 2a1023646 |
| 13 | 166048320 |
| 14 | b82bb91c |
| 15 | 7234b1c0 |
| hex | 48cbc9d6 |
1221315030 has 128 divisors (see below), whose sum is σ = 3520944000. Its totient is φ = 299469312.
The previous prime is 1221314999. The next prime is 1221315059. The reversal of 1221315030 is 305131221.
1221315030 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a super-2 number, since 2×12213150302 = 2983220805007801800, which 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 = 1221314994 and 1221315012.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1224492 + ... + 1225488.
It is an arithmetic number, because the mean of its divisors is an integer number (27507375).
Almost surely, 21221315030 is an apocalyptic number.
1221315030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 1221315030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760472000).
1221315030 is an abundant number, since it is smaller than the sum of its proper divisors (2299628970).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221315030 is a wasteful number, since it uses less digits than its factorization.
1221315030 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1375 (or 1369 counting only the distinct ones).
The product of its (nonzero) digits is 180, while the sum is 18.
The square root of 1221315030 is about 34947.3179228392. The cubic root of 1221315030 is about 1068.9135126861.
Adding to 1221315030 its reverse (305131221), we get a palindrome (1526446251).
The spelling of 1221315030 in words is "one billion, two hundred twenty-one million, three hundred fifteen thousand, thirty".
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