21648702050975 has 48 divisors (see below), whose sum is σ = 27935209264320. Its totient is φ = 16622343091200.

The previous prime is 21648702050953. The next prime is 21648702050977. The reversal of 21648702050975 is 57905020784612.

It is not a de Polignac number, because 21648702050975 - 2¹² = 21648702046879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21648702050975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648702050977) 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 47 ways as a sum of consecutive naturals, for example, 1084539995 + ... + 1084559955.

It is an arithmetic number, because the mean of its divisors is an integer number (581983526340).

Almost surely, 2^{21648702050975} is an apocalyptic number.

21648702050975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21648702050975 is a deficient number, since it is larger than the sum of its proper divisors (6286507213345).

21648702050975 is a wasteful number, since it uses less digits than its factorization.

21648702050975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28820 (or 28815 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 21648702050975 in words is "twenty-one trillion, six hundred forty-eight billion, seven hundred two million, fifty thousand, nine hundred seventy-five".