21929480660 has 12 divisors (see below), whose sum is σ = 46051909428. Its totient is φ = 8771792256.

The previous prime is 21929480659. The next prime is 21929480687. The reversal of 21929480660 is 6608492912.

It can be written as a sum of positive squares in 2 ways, for example, as 3603360784 + 18326119876 = 60028^2 + 135374^2 .

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, 548236997 + ... + 548237036.

It is an arithmetic number, because the mean of its divisors is an integer number (3837659119).

Almost surely, 2^21929480660 is an apocalyptic number.

21929480660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21929480660 is an abundant number, since it is smaller than the sum of its proper divisors (24122428768).

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

21929480660 is a wasteful number, since it uses less digits than its factorization.

21929480660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096474042 (or 1096474040 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 21929480660 in words is "twenty-one billion, nine hundred twenty-nine million, four hundred eighty thousand, six hundred sixty".