21636460037 has 2 divisors, whose sum is σ = 21636460038. Its totient is φ = 21636460036.

The previous prime is 21636459991. The next prime is 21636460051. The reversal of 21636460037 is 73006463612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17802497476 + 3833962561 = 133426^2 + 61919^2 .

It is a cyclic number.

It is not a de Polignac number, because 21636460037 - 2²⁶ = 21569351173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21636468037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10818230018 + 10818230019.

It is an arithmetic number, because the mean of its divisors is an integer number (10818230019).

Almost surely, 2^21636460037 is an apocalyptic number.

It is an amenable number.

21636460037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21636460037 is an equidigital number, since it uses as much as digits as its factorization.

21636460037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 21636460037 in words is "twenty-one billion, six hundred thirty-six million, four hundred sixty thousand, thirty-seven".