21117026297 has 2 divisors, whose sum is σ = 21117026298. Its totient is φ = 21117026296.

The previous prime is 21117026233. The next prime is 21117026321. The reversal of 21117026297 is 79262071112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19865211136 + 1251815161 = 140944^2 + 35381^2 .

It is a cyclic number.

It is not a de Polignac number, because 21117026297 - 2⁶ = 21117026233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21117026297.

It is not a weakly prime, because it can be changed into another prime (21117026897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558513148 + 10558513149.

It is an arithmetic number, because the mean of its divisors is an integer number (10558513149).

Almost surely, 2^21117026297 is an apocalyptic number.

It is an amenable number.

21117026297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21117026297 is an equidigital number, since it uses as much as digits as its factorization.

21117026297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21117026297 in words is "twenty-one billion, one hundred seventeen million, twenty-six thousand, two hundred ninety-seven".