21636460051 has 2 divisors, whose sum is σ = 21636460052. Its totient is φ = 21636460050.

The previous prime is 21636460037. The next prime is 21636460061. The reversal of 21636460051 is 15006463612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21636460051 - 2¹⁵ = 21636427283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21636459989 and 21636460016.

It is not a weakly prime, because it can be changed into another prime (21636460061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10818230025 + 10818230026.

It is an arithmetic number, because the mean of its divisors is an integer number (10818230026).

Almost surely, 2^21636460051 is an apocalyptic number.

21636460051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21636460051 is an equidigital number, since it uses as much as digits as its factorization.

21636460051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21636460051 in words is "twenty-one billion, six hundred thirty-six million, four hundred sixty thousand, fifty-one".