122211221219561 has 2 divisors, whose sum is σ = 122211221219562. Its totient is φ = 122211221219560.

The previous prime is 122211221219551. The next prime is 122211221219597. The reversal of 122211221219561 is 165912122112221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71877077461225 + 50334143758336 = 8478035^2 + 7094656^2 .

It is a cyclic number.

It is not a de Polignac number, because 122211221219561 - 2¹⁸ = 122211220957417 is a prime.

It is not a weakly prime, because it can be changed into another prime (122211221219551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61105610609780 + 61105610609781.

It is an arithmetic number, because the mean of its divisors is an integer number (61105610609781).

Almost surely, 2^{122211221219561} is an apocalyptic number.

It is an amenable number.

122211221219561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122211221219561 is an equidigital number, since it uses as much as digits as its factorization.

122211221219561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 38.

The spelling of 122211221219561 in words is "one hundred twenty-two trillion, two hundred eleven billion, two hundred twenty-one million, two hundred nineteen thousand, five hundred sixty-one".