12927565621 has 2 divisors, whose sum is σ = 12927565622. Its totient is φ = 12927565620.

The previous prime is 12927565601. The next prime is 12927565661. The reversal of 12927565621 is 12656572921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12910640625 + 16924996 = 113625^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12927565621 - 2¹⁷ = 12927434549 is a prime.

It is a super-2 number, since 2×12927565621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12927565601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6463782810 + 6463782811.

It is an arithmetic number, because the mean of its divisors is an integer number (6463782811).

Almost surely, 2^12927565621 is an apocalyptic number.

It is an amenable number.

12927565621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12927565621 is an equidigital number, since it uses as much as digits as its factorization.

12927565621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 46.

The spelling of 12927565621 in words is "twelve billion, nine hundred twenty-seven million, five hundred sixty-five thousand, six hundred twenty-one".