21507006440504 has 32 divisors (see below), whose sum is σ = 45982174407120. Its totient is φ = 9342410036736.

The previous prime is 21507006440477. The next prime is 21507006440573. The reversal of 21507006440504 is 40504460070512.

It is a happy number.

It is a congruent number.

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, 6082296434 + ... + 6082299969.

Almost surely, 2^{21507006440504} is an apocalyptic number.

It is an amenable number.

21507006440504 is an abundant number, since it is smaller than the sum of its proper divisors (24475167966616).

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

21507006440504 is a wasteful number, since it uses less digits than its factorization.

21507006440504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12164596439 (or 12164596435 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

The spelling of 21507006440504 in words is "twenty-one trillion, five hundred seven billion, six million, four hundred forty thousand, five hundred four".