21699771156 has 48 divisors (see below), whose sum is σ = 64295620480. Its totient is φ = 6199934400.

The previous prime is 21699771143. The next prime is 21699771167. The reversal of 21699771156 is 65117799612.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14350945 + ... + 14352456.

Almost surely, 2^21699771156 is an apocalyptic number.

It is an amenable number.

21699771156 is an abundant number, since it is smaller than the sum of its proper divisors (42595849324).

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

21699771156 is a wasteful number, since it uses less digits than its factorization.

21699771156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28703421 (or 28703413 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The spelling of 21699771156 in words is "twenty-one billion, six hundred ninety-nine million, seven hundred seventy-one thousand, one hundred fifty-six".