21321432708 has 48 divisors (see below), whose sum is σ = 52689087360. Its totient is φ = 6687476224.

The previous prime is 21321432707. The next prime is 21321432721. The reversal of 21321432708 is 80723412312.

It is a super-3 number, since 3×21321432708³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321432707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1071958 + ... + 1091666.

It is an arithmetic number, because the mean of its divisors is an integer number (1097689320).

Almost surely, 2^21321432708 is an apocalyptic number.

It is an amenable number.

21321432708 is an abundant number, since it is smaller than the sum of its proper divisors (31367654652).

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

21321432708 is a wasteful number, since it uses less digits than its factorization.

21321432708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25036 (or 25034 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The spelling of 21321432708 in words is "twenty-one billion, three hundred twenty-one million, four hundred thirty-two thousand, seven hundred eight".