21612037272075 has 36 divisors (see below), whose sum is σ = 38817386309520. Its totient is φ = 11494312816320.

The previous prime is 21612037272047. The next prime is 21612037272103. The reversal of 21612037272075 is 57027273021612.

21612037272075 is a `hidden beast` number, since 2 + 1 + 612 + 0 + 3 + 7 + 2 + 7 + 20 + 7 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21612037272047) and next prime (21612037272103).

It is not a de Polignac number, because 21612037272075 - 2⁶ = 21612037272011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21612037272075.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 133698472 + ... + 133860021.

It is an arithmetic number, because the mean of its divisors is an integer number (1078260730820).

Almost surely, 2^{21612037272075} is an apocalyptic number.

21612037272075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21612037272075 is a deficient number, since it is larger than the sum of its proper divisors (17205349037445).

21612037272075 is a wasteful number, since it uses less digits than its factorization.

21612037272075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267558868 (or 267558860 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 21612037272075 in words is "twenty-one trillion, six hundred twelve billion, thirty-seven million, two hundred seventy-two thousand, seventy-five".