21613291074 has 40 divisors (see below), whose sum is σ = 49738708668. Its totient is φ = 7009714080.

The previous prime is 21613291009. The next prime is 21613291123. The reversal of 21613291074 is 47019231612.

21613291074 is a `hidden beast` number, since 2 + 1 + 613 + 29 + 10 + 7 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20034420849 + 1578870225 = 141543^2 + 39735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1796917 + ... + 1808904.

Almost surely, 2^21613291074 is an apocalyptic number.

21613291074 is an abundant number, since it is smaller than the sum of its proper divisors (28125417594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21613291074 is a wasteful number, since it uses less digits than its factorization.

21613291074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605872 (or 3605863 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 21613291074 in words is "twenty-one billion, six hundred thirteen million, two hundred ninety-one thousand, seventy-four".