123607990021 has 2 divisors, whose sum is σ = 123607990022. Its totient is φ = 123607990020.

The previous prime is 123607989929. The next prime is 123607990039. The reversal of 123607990021 is 120099706321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66432485025 + 57175504996 = 257745^2 + 239114^2 .

It is a cyclic number.

It is not a de Polignac number, because 123607990021 - 2¹¹ = 123607987973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123607990081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61803995010 + 61803995011.

It is an arithmetic number, because the mean of its divisors is an integer number (61803995011).

Almost surely, 2^123607990021 is an apocalyptic number.

It is an amenable number.

123607990021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123607990021 is an equidigital number, since it uses as much as digits as its factorization.

123607990021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The spelling of 123607990021 in words is "one hundred twenty-three billion, six hundred seven million, nine hundred ninety thousand, twenty-one".