21456038024 has 16 divisors (see below), whose sum is σ = 40420738320. Its totient is φ = 10677174480.

The previous prime is 21456037997. The next prime is 21456038027. The reversal of 21456038024 is 42083065412.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21456038027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6353774 + ... + 6357149.

It is an arithmetic number, because the mean of its divisors is an integer number (2526296145).

Almost surely, 2^21456038024 is an apocalyptic number.

It is an amenable number.

21456038024 is a deficient number, since it is larger than the sum of its proper divisors (18964700296).

21456038024 is a wasteful number, since it uses less digits than its factorization.

21456038024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12711140 (or 12711136 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 21456038024 in words is "twenty-one billion, four hundred fifty-six million, thirty-eight thousand, twenty-four".