22121112139957 has 2 divisors, whose sum is σ = 22121112139958. Its totient is φ = 22121112139956.

The previous prime is 22121112139921. The next prime is 22121112140021. The reversal of 22121112139957 is 75993121112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20821708212561 + 1299403927396 = 4563081^2 + 1139914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121112139957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121112199957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060556069978 + 11060556069979.

It is an arithmetic number, because the mean of its divisors is an integer number (11060556069979).

Almost surely, 2^{22121112139957} is an apocalyptic number.

It is an amenable number.

22121112139957 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121112139957 is an equidigital number, since it uses as much as digits as its factorization.

22121112139957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The spelling of 22121112139957 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred thirty-nine thousand, nine hundred fifty-seven".