21275814760685 has 16 divisors (see below), whose sum is σ = 25543401404976. Its totient is φ = 17012370505728.

The previous prime is 21275814760643. The next prime is 21275814760751. The reversal of 21275814760685 is 58606741857212.

It can be written as a sum of positive squares in 8 ways, for example, as 126825727876 + 21148989032809 = 356126^2 + 4598803^2 .

It is a cyclic number.

It is not a de Polignac number, because 21275814760685 - 2²⁴ = 21275797983469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164816987 + ... + 164946023.

It is an arithmetic number, because the mean of its divisors is an integer number (1596462587811).

Almost surely, 2^{21275814760685} is an apocalyptic number.

It is an amenable number.

21275814760685 is a deficient number, since it is larger than the sum of its proper divisors (4267586644291).

21275814760685 is a wasteful number, since it uses less digits than its factorization.

21275814760685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144832.

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 21275814760685 in words is "twenty-one trillion, two hundred seventy-five billion, eight hundred fourteen million, seven hundred sixty thousand, six hundred eighty-five".