21617932136 has 16 divisors (see below), whose sum is σ = 41298408900. Its totient is φ = 10605023104.

The previous prime is 21617932067. The next prime is 21617932223. The reversal of 21617932136 is 63123971612.

It can be written as a sum of positive squares in 2 ways, for example, as 20418695236 + 1199236900 = 142894^2 + 34630^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21617932093 and 21617932102.

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, 25492421 + ... + 25493268.

Almost surely, 2^21617932136 is an apocalyptic number.

It is an amenable number.

21617932136 is a deficient number, since it is larger than the sum of its proper divisors (19680476764).

21617932136 is a wasteful number, since it uses less digits than its factorization.

21617932136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50985748 (or 50985744 counting only the distinct ones).

The product of its digits is 81648, while the sum is 41.

The spelling of 21617932136 in words is "twenty-one billion, six hundred seventeen million, nine hundred thirty-two thousand, one hundred thirty-six".