21507460345775 has 12 divisors (see below), whose sum is σ = 26671074322200. Its totient is φ = 17204791829280.

The previous prime is 21507460345727. The next prime is 21507460345781. The reversal of 21507460345775 is 57754306470512.

It is not a de Polignac number, because 21507460345775 - 2²⁰ = 21507459297199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21507460345775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29038145 + ... + 29769594.

It is an arithmetic number, because the mean of its divisors is an integer number (2222589526850).

Almost surely, 2^{21507460345775} is an apocalyptic number.

21507460345775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21507460345775 is a deficient number, since it is larger than the sum of its proper divisors (5163613976425).

21507460345775 is a wasteful number, since it uses less digits than its factorization.

21507460345775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58822378 (or 58822373 counting only the distinct ones).

The product of its (nonzero) digits is 24696000, while the sum is 56.

The spelling of 21507460345775 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, three hundred forty-five thousand, seven hundred seventy-five".