21604073172375 has 32 divisors (see below), whose sum is σ = 35954585364672. Its totient is φ = 11520439152000.

The previous prime is 21604073172371. The next prime is 21604073172379. The reversal of 21604073172375 is 57327137040612.

It is an interprime number because it is at equal distance from previous prime (21604073172371) and next prime (21604073172379).

It is not a de Polignac number, because 21604073172375 - 2² = 21604073172371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604073172371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1834816 + ... + 6824565.

It is an arithmetic number, because the mean of its divisors is an integer number (1123580792646).

Almost surely, 2^{21604073172375} is an apocalyptic number.

21604073172375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21604073172375 is a deficient number, since it is larger than the sum of its proper divisors (14350512192297).

21604073172375 is an equidigital number, since it uses as much as digits as its factorization.

21604073172375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8666052 (or 8666042 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 48.

The spelling of 21604073172375 in words is "twenty-one trillion, six hundred four billion, seventy-three million, one hundred seventy-two thousand, three hundred seventy-five".