21060672052257 has 24 divisors (see below), whose sum is σ = 32022854660160. Its totient is φ = 13301153004960.

The previous prime is 21060672052237. The next prime is 21060672052267. The reversal of 21060672052257 is 75225027606012.

21060672052257 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 0 + 6 + 72 + 0 + 522 + 57 = 666.

It is not a de Polignac number, because 21060672052257 - 2⁷ = 21060672052129 is a prime.

It is a super-2 number, since 2×21060672052257² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21060672052237) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5637628 + ... + 8596754.

It is an arithmetic number, because the mean of its divisors is an integer number (1334285610840).

Almost surely, 2^{21060672052257} is an apocalyptic number.

It is an amenable number.

21060672052257 is a deficient number, since it is larger than the sum of its proper divisors (10962182607903).

21060672052257 is a wasteful number, since it uses less digits than its factorization.

21060672052257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000773 (or 3000770 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

Adding to 21060672052257 its reverse (75225027606012), we get a palindrome (96285699658269).

The spelling of 21060672052257 in words is "twenty-one trillion, sixty billion, six hundred seventy-two million, fifty-two thousand, two hundred fifty-seven".