21603265604040 has 128 divisors (see below), whose sum is σ = 68327272137600. Its totient is φ = 5449152430080.

The previous prime is 21603265604029. The next prime is 21603265604069. The reversal of 21603265604040 is 4040656230612.

It is a self number, because there is not a number n which added to its sum of digits gives 21603265604040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5929407 + ... + 8852366.

It is an arithmetic number, because the mean of its divisors is an integer number (533806813575).

Almost surely, 2^{21603265604040} is an apocalyptic number.

21603265604040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21603265604040 is an abundant number, since it is smaller than the sum of its proper divisors (46724006533560).

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

21603265604040 is a wasteful number, since it uses less digits than its factorization.

21603265604040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14782447 (or 14782443 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21603265604040 in words is "twenty-one trillion, six hundred three billion, two hundred sixty-five million, six hundred four thousand, forty".