21424795920 has 160 divisors (see below), whose sum is σ = 80505383040. Its totient is φ = 5193884160.

The previous prime is 21424795913. The next prime is 21424795957. The reversal of 21424795920 is 2959742412.

21424795920 is a `hidden beast` number, since 2 + 14 + 2 + 47 + 9 + 592 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 427099 + ... + 474618.

It is an arithmetic number, because the mean of its divisors is an integer number (503158644).

Almost surely, 2^21424795920 is an apocalyptic number.

21424795920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424795920 is an abundant number, since it is smaller than the sum of its proper divisors (59080587120).

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

21424795920 is a wasteful number, since it uses less digits than its factorization.

21424795920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901750 (or 901738 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 21424795920 in words is "twenty-one billion, four hundred twenty-four million, seven hundred ninety-five thousand, nine hundred twenty".