122138822857 has 2 divisors, whose sum is σ = 122138822858. Its totient is φ = 122138822856.

The previous prime is 122138822809. The next prime is 122138822893. The reversal of 122138822857 is 758228831221.

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., 83761621056 + 38377201801 = 289416^2 + 195901^2 .

It is a cyclic number.

It is not a de Polignac number, because 122138822857 - 2²³ = 122130434249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122138822857.

It is not a weakly prime, because it can be changed into another prime (122138802857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61069411428 + 61069411429.

It is an arithmetic number, because the mean of its divisors is an integer number (61069411429).

Almost surely, 2^122138822857 is an apocalyptic number.

It is an amenable number.

122138822857 is a deficient number, since it is larger than the sum of its proper divisors (1).

122138822857 is an equidigital number, since it uses as much as digits as its factorization.

122138822857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 860160, while the sum is 49.

The spelling of 122138822857 in words is "one hundred twenty-two billion, one hundred thirty-eight million, eight hundred twenty-two thousand, eight hundred fifty-seven".