123112313921 has 2 divisors, whose sum is σ = 123112313922. Its totient is φ = 123112313920.

The previous prime is 123112313917. The next prime is 123112313983. The reversal of 123112313921 is 129313211321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121042063921 + 2070250000 = 347911^2 + 45500^2 .

It is a cyclic number.

It is not a de Polignac number, because 123112313921 - 2² = 123112313917 is a prime.

It is not a weakly prime, because it can be changed into another prime (123112319921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61556156960 + 61556156961.

It is an arithmetic number, because the mean of its divisors is an integer number (61556156961).

Almost surely, 2^123112313921 is an apocalyptic number.

It is an amenable number.

123112313921 is a deficient number, since it is larger than the sum of its proper divisors (1).

123112313921 is an equidigital number, since it uses as much as digits as its factorization.

123112313921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

It can be divided in two parts, 12311 and 2313921, that added together give a palindrome (2326232).

The spelling of 123112313921 in words is "one hundred twenty-three billion, one hundred twelve million, three hundred thirteen thousand, nine hundred twenty-one".