123312333721 has 2 divisors, whose sum is σ = 123312333722. Its totient is φ = 123312333720.

The previous prime is 123312333709. The next prime is 123312333757. The reversal of 123312333721 is 127333213321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92301123721 + 31011210000 = 303811^2 + 176100^2 .

It is a cyclic number.

It is not a de Polignac number, because 123312333721 - 2⁷ = 123312333593 is a prime.

It is not a weakly prime, because it can be changed into another prime (123312333421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61656166860 + 61656166861.

It is an arithmetic number, because the mean of its divisors is an integer number (61656166861).

Almost surely, 2^123312333721 is an apocalyptic number.

It is an amenable number.

123312333721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123312333721 is an equidigital number, since it uses as much as digits as its factorization.

123312333721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 31.

The spelling of 123312333721 in words is "one hundred twenty-three billion, three hundred twelve million, three hundred thirty-three thousand, seven hundred twenty-one".