122904375721 has 2 divisors, whose sum is σ = 122904375722. Its totient is φ = 122904375720.

The previous prime is 122904375701. The next prime is 122904375733. The reversal of 122904375721 is 127573409221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87045651225 + 35858724496 = 295035^2 + 189364^2 .

It is a cyclic number.

It is not a de Polignac number, because 122904375721 - 2¹⁷ = 122904244649 is a prime.

It is not a weakly prime, because it can be changed into another prime (122904375701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61452187860 + 61452187861.

It is an arithmetic number, because the mean of its divisors is an integer number (61452187861).

Almost surely, 2^122904375721 is an apocalyptic number.

It is an amenable number.

122904375721 is a deficient number, since it is larger than the sum of its proper divisors (1).

122904375721 is an equidigital number, since it uses as much as digits as its factorization.

122904375721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 122904375721 in words is "one hundred twenty-two billion, nine hundred four million, three hundred seventy-five thousand, seven hundred twenty-one".