21660007503504 has 40 divisors (see below), whose sum is σ = 56042312785632. Its totient is φ = 7208738836480.

The previous prime is 21660007503503. The next prime is 21660007503523. The reversal of 21660007503504 is 40530570006612.

It is not an unprimeable number, because it can be changed into a prime (21660007503503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351958434 + ... + 352019969.

Almost surely, 2^{21660007503504} is an apocalyptic number.

21660007503504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21660007503504 is an abundant number, since it is smaller than the sum of its proper divisors (34382305282128).

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

21660007503504 is a wasteful number, since it uses less digits than its factorization.

21660007503504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703979055 (or 703979049 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21660007503504 in words is "twenty-one trillion, six hundred sixty billion, seven million, five hundred three thousand, five hundred four".