21504252504 has 96 divisors (see below), whose sum is σ = 63598046400. Its totient is φ = 6039915840.

The previous prime is 21504252499. The next prime is 21504252559. The reversal of 21504252504 is 40525240512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85582 + ... + 224349.

It is an arithmetic number, because the mean of its divisors is an integer number (662479650).

Almost surely, 2^21504252504 is an apocalyptic number.

21504252504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21504252504 is an abundant number, since it is smaller than the sum of its proper divisors (42093793896).

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

21504252504 is a wasteful number, since it uses less digits than its factorization.

21504252504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310013 (or 310002 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

It can be divided in two parts, 215042 and 52504, that added together give a triangular number (267546 = T₇₃₁).

The spelling of 21504252504 in words is "twenty-one billion, five hundred four million, two hundred fifty-two thousand, five hundred four".