21817651114 has 48 divisors (see below), whose sum is σ = 40336217352. Its totient is φ = 8794447872.

The previous prime is 21817651069. The next prime is 21817651157. The reversal of 21817651114 is 41115671812.

It can be written as a sum of positive squares in 4 ways, for example, as 19344080889 + 2473570225 = 139083^2 + 49735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3123594 + ... + 3130570.

Almost surely, 2^21817651114 is an apocalyptic number.

21817651114 is a deficient number, since it is larger than the sum of its proper divisors (18518566238).

21817651114 is a wasteful number, since it uses less digits than its factorization.

21817651114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8887 (or 8880 counting only the distinct ones).

The product of its digits is 13440, while the sum is 37.

The spelling of 21817651114 in words is "twenty-one billion, eight hundred seventeen million, six hundred fifty-one thousand, one hundred fourteen".