21307571384 has 32 divisors (see below), whose sum is σ = 46147417200. Its totient is φ = 9115537920.

The previous prime is 21307571357. The next prime is 21307571387. The reversal of 21307571384 is 48317570312.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21307571387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7120019 + ... + 7123010.

Almost surely, 2^21307571384 is an apocalyptic number.

It is an amenable number.

21307571384 is an abundant number, since it is smaller than the sum of its proper divisors (24839845816).

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

21307571384 is a wasteful number, since it uses less digits than its factorization.

21307571384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243063 (or 14243059 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21307571384 in words is "twenty-one billion, three hundred seven million, five hundred seventy-one thousand, three hundred eighty-four".