21652560543461 has 2 divisors, whose sum is σ = 21652560543462. Its totient is φ = 21652560543460.

The previous prime is 21652560543451. The next prime is 21652560543499. The reversal of 21652560543461 is 16434506525612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19889191672900 + 1763368870561 = 4459730^2 + 1327919^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652560543461 - 2³⁸ = 21377682636517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21652560543421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826280271730 + 10826280271731.

It is an arithmetic number, because the mean of its divisors is an integer number (10826280271731).

Almost surely, 2^{21652560543461} is an apocalyptic number.

It is an amenable number.

21652560543461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652560543461 is an equidigital number, since it uses as much as digits as its factorization.

21652560543461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 21652560543461 in words is "twenty-one trillion, six hundred fifty-two billion, five hundred sixty million, five hundred forty-three thousand, four hundred sixty-one".