21726309912 has 16 divisors (see below), whose sum is σ = 54315774840. Its totient is φ = 7242103296.

The previous prime is 21726309901. The next prime is 21726309923. The reversal of 21726309912 is 21990362712.

It is an interprime number because it is at equal distance from previous prime (21726309901) and next prime (21726309923).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 452631433 + ... + 452631480.

Almost surely, 2^21726309912 is an apocalyptic number.

It is an amenable number.

21726309912 is an abundant number, since it is smaller than the sum of its proper divisors (32589464928).

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

21726309912 is a wasteful number, since it uses less digits than its factorization.

21726309912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905262922 (or 905262918 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 21726309912 in words is "twenty-one billion, seven hundred twenty-six million, three hundred nine thousand, nine hundred twelve".