122564021 has 2 divisors, whose sum is σ = 122564022. Its totient is φ = 122564020.

The previous prime is 122564011. The next prime is 122564027. The reversal of 122564021 is 120465221.

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., 112572100 + 9991921 = 10610^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 122564021 - 2⁶ = 122563957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122564027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61282010 + 61282011.

It is an arithmetic number, because the mean of its divisors is an integer number (61282011).

Almost surely, 2^122564021 is an apocalyptic number.

It is an amenable number.

122564021 is a deficient number, since it is larger than the sum of its proper divisors (1).

122564021 is an equidigital number, since it uses as much as digits as its factorization.

122564021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 122564021 is about 11070.8636067833. The cubic root of 122564021 is about 496.7306979190.

The spelling of 122564021 in words is "one hundred twenty-two million, five hundred sixty-four thousand, twenty-one".