21690676812 has 96 divisors (see below), whose sum is σ = 59770138624. Its totient is φ = 5991148800.

The previous prime is 21690676801. The next prime is 21690676841. The reversal of 21690676812 is 21867609612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2842362 + ... + 2849982.

Almost surely, 2^21690676812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21690676812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29885069312).

21690676812 is an abundant number, since it is smaller than the sum of its proper divisors (38079461812).

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

21690676812 is a wasteful number, since it uses less digits than its factorization.

21690676812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759 (or 8757 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 21690676812 in words is "twenty-one billion, six hundred ninety million, six hundred seventy-six thousand, eight hundred twelve".