21375172117611 has 64 divisors (see below), whose sum is σ = 34256628940800. Its totient is φ = 13094649412992.

The previous prime is 21375172117577. The next prime is 21375172117627. The reversal of 21375172117611 is 11671127157312.

21375172117611 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 5 + 1 + 7 + 21 + 1 + 7 + 611 = 666.

It is not a de Polignac number, because 21375172117611 - 2²⁷ = 21375037899883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21375172113611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 750966766 + ... + 750995228.

It is an arithmetic number, because the mean of its divisors is an integer number (535259827200).

Almost surely, 2^{21375172117611} is an apocalyptic number.

21375172117611 is a deficient number, since it is larger than the sum of its proper divisors (12881456823189).

21375172117611 is a wasteful number, since it uses less digits than its factorization.

21375172117611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38057 (or 38051 counting only the distinct ones).

The product of its digits is 123480, while the sum is 45.

The spelling of 21375172117611 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-two million, one hundred seventeen thousand, six hundred eleven".