21608708036 has 12 divisors (see below), whose sum is σ = 37823819712. Its totient is φ = 10801902408.

The previous prime is 21608708021. The next prime is 21608708057. The reversal of 21608708036 is 63080780612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21608707984 and 21608708002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593000 + ... + 628383.

It is an arithmetic number, because the mean of its divisors is an integer number (3151984976).

Almost surely, 2^21608708036 is an apocalyptic number.

It is an amenable number.

21608708036 is a deficient number, since it is larger than the sum of its proper divisors (16215111676).

21608708036 is a wasteful number, since it uses less digits than its factorization.

21608708036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225810 (or 1225808 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21608708036 in words is "twenty-one billion, six hundred eight million, seven hundred eight thousand, thirty-six".