21312053004 has 24 divisors (see below), whose sum is σ = 54248862528. Its totient is φ = 6458197840.

The previous prime is 21312052997. The next prime is 21312053033. The reversal of 21312053004 is 40035021312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80727342 + ... + 80727605.

It is an arithmetic number, because the mean of its divisors is an integer number (2260369272).

Almost surely, 2^21312053004 is an apocalyptic number.

It is an amenable number.

21312053004 is an abundant number, since it is smaller than the sum of its proper divisors (32936809524).

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

21312053004 is a wasteful number, since it uses less digits than its factorization.

21312053004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161454965 (or 161454963 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21312053004 its reverse (40035021312), we get a palindrome (61347074316).

The spelling of 21312053004 in words is "twenty-one billion, three hundred twelve million, fifty-three thousand, four".