21603343413872 has 40 divisors (see below), whose sum is σ = 45662205288960. Its totient is φ = 9819574009280.

The previous prime is 21603343413871. The next prime is 21603343413887. The reversal of 21603343413872 is 27831434330612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603343413871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13520363 + ... + 15033525.

It is an arithmetic number, because the mean of its divisors is an integer number (1141555132224).

Almost surely, 2^{21603343413872} is an apocalyptic number.

21603343413872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21603343413872 is an abundant number, since it is smaller than the sum of its proper divisors (24058861875088).

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

21603343413872 is a wasteful number, since it uses less digits than its factorization.

21603343413872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594301 (or 1594295 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 21603343413872 in words is "twenty-one trillion, six hundred three billion, three hundred forty-three million, four hundred thirteen thousand, eight hundred seventy-two".