21507460044677 has 2 divisors, whose sum is σ = 21507460044678. Its totient is φ = 21507460044676.

The previous prime is 21507460044617. The next prime is 21507460044683. The reversal of 21507460044677 is 77644006470512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20918420679556 + 589039365121 = 4573666^2 + 767489^2 .

It is a cyclic number.

It is not a de Polignac number, because 21507460044677 - 2¹⁰ = 21507460043653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507460044617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753730022338 + 10753730022339.

It is an arithmetic number, because the mean of its divisors is an integer number (10753730022339).

Almost surely, 2^{21507460044677} is an apocalyptic number.

It is an amenable number.

21507460044677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507460044677 is an equidigital number, since it uses as much as digits as its factorization.

21507460044677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7902720, while the sum is 53.

The spelling of 21507460044677 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, forty-four thousand, six hundred seventy-seven".