21603213653504 has 120 divisors (see below), whose sum is σ = 52394563484208. Its totient is φ = 8855975546880.

The previous prime is 21603213653501. The next prime is 21603213653579. The reversal of 21603213653504 is 40535631230612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603213653501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18142487 + ... + 19296534.

Almost surely, 2^{21603213653504} is an apocalyptic number.

It is an amenable number.

21603213653504 is an abundant number, since it is smaller than the sum of its proper divisors (30791349830704).

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

21603213653504 is an equidigital number, since it uses as much as digits as its factorization.

21603213653504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37439076 (or 37439053 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21603213653504 in words is "twenty-one trillion, six hundred three billion, two hundred thirteen million, six hundred fifty-three thousand, five hundred four".