122808643421 has 2 divisors, whose sum is σ = 122808643422. Its totient is φ = 122808643420.

The previous prime is 122808643393. The next prime is 122808643439. The reversal of 122808643421 is 124346808221.

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., 112905408196 + 9903235225 = 336014^2 + 99515^2 .

It is a cyclic number.

It is not a de Polignac number, because 122808643421 - 2⁶ = 122808643357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122808643621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61404321710 + 61404321711.

It is an arithmetic number, because the mean of its divisors is an integer number (61404321711).

Almost surely, 2^122808643421 is an apocalyptic number.

It is an amenable number.

122808643421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122808643421 is an equidigital number, since it uses as much as digits as its factorization.

122808643421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 122808643421 in words is "one hundred twenty-two billion, eight hundred eight million, six hundred forty-three thousand, four hundred twenty-one".