21307486320 has 160 divisors (see below), whose sum is σ = 73778135040. Its totient is φ = 5652138240.

The previous prime is 21307486309. The next prime is 21307486337. The reversal of 21307486320 is 2368470312.

It is a happy number.

21307486320 is a `hidden beast` number, since 2 + 13 + 0 + 7 + 4 + 8 + 632 + 0 = 666.

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

It is a congruent number.

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, 386737 + ... + 438383.

It is an arithmetic number, because the mean of its divisors is an integer number (461113344).

Almost surely, 2^21307486320 is an apocalyptic number.

21307486320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21307486320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36889067520).

21307486320 is an abundant number, since it is smaller than the sum of its proper divisors (52470648720).

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

21307486320 is a wasteful number, since it uses less digits than its factorization.

21307486320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51860 (or 51848 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 21307486320 in words is "twenty-one billion, three hundred seven million, four hundred eighty-six thousand, three hundred twenty".