21004314504 has 32 divisors (see below), whose sum is σ = 55599657120. Its totient is φ = 6589588736.

The previous prime is 21004314493. The next prime is 21004314547. The reversal of 21004314504 is 40541340012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25740174 + ... + 25740989.

It is an arithmetic number, because the mean of its divisors is an integer number (1737489285).

Almost surely, 2^21004314504 is an apocalyptic number.

21004314504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21004314504 is an abundant number, since it is smaller than the sum of its proper divisors (34595342616).

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

21004314504 is a wasteful number, since it uses less digits than its factorization.

21004314504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51481189 (or 51481185 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21004314504 its reverse (40541340012), we get a palindrome (61545654516).

The spelling of 21004314504 in words is "twenty-one billion, four million, three hundred fourteen thousand, five hundred four".