122922721 has 2 divisors, whose sum is σ = 122922722. Its totient is φ = 122922720.

The previous prime is 122922707. The next prime is 122922727. The reversal of 122922721 is 127229221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113188321 + 9734400 = 10639^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 122922721 - 2⁷ = 122922593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122922721.

It is not a weakly prime, because it can be changed into another prime (122922727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61461360 + 61461361.

It is an arithmetic number, because the mean of its divisors is an integer number (61461361).

Almost surely, 2^122922721 is an apocalyptic number.

It is an amenable number.

122922721 is a deficient number, since it is larger than the sum of its proper divisors (1).

122922721 is an equidigital number, since it uses as much as digits as its factorization.

122922721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 122922721 is about 11087.0519526157. The cubic root of 122922721 is about 497.2148088951.

The spelling of 122922721 in words is "one hundred twenty-two million, nine hundred twenty-two thousand, seven hundred twenty-one".