21375172117602 has 24 divisors (see below), whose sum is σ = 46313823878400. Its totient is φ = 7124911071480.

The previous prime is 21375172117577. The next prime is 21375172117627. The reversal of 21375172117602 is 20671127157312.

21375172117602 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 5 + 1 + 7 + 21 + 17 + 602 = 666.

It is an interprime number because it is at equal distance from previous prime (21375172117577) and next prime (21375172117627).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11288974 + ... + 13045737.

It is an arithmetic number, because the mean of its divisors is an integer number (1929742661600).

Almost surely, 2^{21375172117602} is an apocalyptic number.

21375172117602 is an abundant number, since it is smaller than the sum of its proper divisors (24938651760798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21375172117602 is a wasteful number, since it uses less digits than its factorization.

21375172117602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24383518 (or 24383515 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 21375172117602 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-two million, one hundred seventeen thousand, six hundred two".