21636111367097 has 2 divisors, whose sum is σ = 21636111367098. Its totient is φ = 21636111367096.

The previous prime is 21636111367093. The next prime is 21636111367163. The reversal of 21636111367097 is 79076311163612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17442016260496 + 4194095106601 = 4176364^2 + 2047949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21636111367097 - 2² = 21636111367093 is a prime.

It is not a weakly prime, because it can be changed into another prime (21636111367093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10818055683548 + 10818055683549.

It is an arithmetic number, because the mean of its divisors is an integer number (10818055683549).

Almost surely, 2^{21636111367097} is an apocalyptic number.

It is an amenable number.

21636111367097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21636111367097 is an equidigital number, since it uses as much as digits as its factorization.

21636111367097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The spelling of 21636111367097 in words is "twenty-one trillion, six hundred thirty-six billion, one hundred eleven million, three hundred sixty-seven thousand, ninety-seven".