30621917512 has 16 divisors (see below), whose sum is σ = 57512927340. Its totient is φ = 15285136896.

The previous prime is 30621917497. The next prime is 30621917519. The reversal of 30621917512 is 21571912603.

It can be written as a sum of positive squares in 2 ways, for example, as 30501225316 + 120692196 = 174646^2 + 10986^2 .

It is a super-2 number, since 2×30621917512² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30621917519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3222693 + ... + 3232180.

Almost surely, 2^30621917512 is an apocalyptic number.

It is an amenable number.

30621917512 is a deficient number, since it is larger than the sum of its proper divisors (26891009828).

30621917512 is a wasteful number, since it uses less digits than its factorization.

30621917512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455472 (or 6455468 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 30621917512 in words is "thirty billion, six hundred twenty-one million, nine hundred seventeen thousand, five hundred twelve".