21606615104 has 56 divisors (see below), whose sum is σ = 46183100928. Its totient is φ = 10000235520.

The previous prime is 21606615089. The next prime is 21606615109. The reversal of 21606615104 is 40151660612.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (21606615109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191117 + ... + 282380.

Almost surely, 2^21606615104 is an apocalyptic number.

It is an amenable number.

21606615104 is an abundant number, since it is smaller than the sum of its proper divisors (24576485824).

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

21606615104 is a wasteful number, since it uses less digits than its factorization.

21606615104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473563 (or 473553 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21606615104 in words is "twenty-one billion, six hundred six million, six hundred fifteen thousand, one hundred four".