21930446464 has 48 divisors (see below), whose sum is σ = 43874018370. Its totient is φ = 10919120384.

The previous prime is 21930446459. The next prime is 21930446509. The reversal of 21930446464 is 46464403912.

It can be written as a sum of positive squares in only one way, i.e., 18703297600 + 3227148864 = 136760^2 + 56808^2 .

It is a super-2 number, since 2×21930446464² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21930446464.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8852394 + ... + 8854870.

Almost surely, 2^21930446464 is an apocalyptic number.

It is an amenable number.

21930446464 is an abundant number, since it is smaller than the sum of its proper divisors (21943571906).

21930446464 is an frugal number, since it uses more digits than its factorization.

21930446464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017 (or 2742 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 21930446464 in words is "twenty-one billion, nine hundred thirty million, four hundred forty-six thousand, four hundred sixty-four".