21404765160 has 80 divisors (see below), whose sum is σ = 71943804900. Its totient is φ = 5707936512.

The previous prime is 21404765159. The next prime is 21404765177. The reversal of 21404765160 is 6156740412.

21404765160 is a `hidden beast` number, since 21 + 4 + 0 + 476 + 5 + 160 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21241896516 + 162868644 = 145746^2 + 12762^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3299965 + ... + 3306444.

Almost surely, 2^21404765160 is an apocalyptic number.

21404765160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404765160 is an abundant number, since it is smaller than the sum of its proper divisors (50539039740).

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

21404765160 is a wasteful number, since it uses less digits than its factorization.

21404765160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606432 (or 6606419 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21404765160 in words is "twenty-one billion, four hundred four million, seven hundred sixty-five thousand, one hundred sixty".