123000013021 has 2 divisors, whose sum is σ = 123000013022. Its totient is φ = 123000013020.

The previous prime is 123000013009. The next prime is 123000013027. The reversal of 123000013021 is 120310000321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71684172121 + 51315840900 = 267739^2 + 226530^2 .

It is a cyclic number.

It is not a de Polignac number, because 123000013021 - 2⁷ = 123000012893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123000012992 and 123000013010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123000013027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61500006510 + 61500006511.

It is an arithmetic number, because the mean of its divisors is an integer number (61500006511).

Almost surely, 2^123000013021 is an apocalyptic number.

It is an amenable number.

123000013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123000013021 is an equidigital number, since it uses as much as digits as its factorization.

123000013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 123000013021 its reverse (120310000321), we get a palindrome (243310013342).

The spelling of 123000013021 in words is "one hundred twenty-three billion, thirteen thousand, twenty-one".