21612105123575 has 12 divisors (see below), whose sum is σ = 26799538960800. Its totient is φ = 17289343061760.

The previous prime is 21612105123563. The next prime is 21612105123593. The reversal of 21612105123575 is 57532150121612.

It is not a de Polignac number, because 21612105123575 - 2²⁶ = 21612038014711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7229279 + ... + 9771728.

It is an arithmetic number, because the mean of its divisors is an integer number (2233294913400).

Almost surely, 2^{21612105123575} is an apocalyptic number.

21612105123575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21612105123575 is a deficient number, since it is larger than the sum of its proper divisors (5187433837225).

21612105123575 is a wasteful number, since it uses less digits than its factorization.

21612105123575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17051866 (or 17051861 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 21612105123575 in words is "twenty-one trillion, six hundred twelve billion, one hundred five million, one hundred twenty-three thousand, five hundred seventy-five".