21992404460 has 48 divisors (see below), whose sum is σ = 49786077600. Its totient is φ = 8112205824.

The previous prime is 21992404459. The next prime is 21992404471. The reversal of 21992404460 is 6440429912.

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, 223436 + ... + 306444.

It is an arithmetic number, because the mean of its divisors is an integer number (1037209950).

Almost surely, 2^21992404460 is an apocalyptic number.

21992404460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21992404460 is an abundant number, since it is smaller than the sum of its proper divisors (27793673140).

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

21992404460 is a wasteful number, since it uses less digits than its factorization.

21992404460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84050 (or 84048 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21992404460 in words is "twenty-one billion, nine hundred ninety-two million, four hundred four thousand, four hundred sixty".