122057457421 has 2 divisors, whose sum is σ = 122057457422. Its totient is φ = 122057457420.

The previous prime is 122057457409. The next prime is 122057457427. The reversal of 122057457421 is 124754750221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75202092900 + 46855364521 = 274230^2 + 216461^2 .

It is an emirp because it is prime and its reverse (124754750221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122057457421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122057457427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61028728710 + 61028728711.

It is an arithmetic number, because the mean of its divisors is an integer number (61028728711).

Almost surely, 2^122057457421 is an apocalyptic number.

It is an amenable number.

122057457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122057457421 is an equidigital number, since it uses as much as digits as its factorization.

122057457421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 40.

The spelling of 122057457421 in words is "one hundred twenty-two billion, fifty-seven million, four hundred fifty-seven thousand, four hundred twenty-one".