123240325921 has 2 divisors, whose sum is σ = 123240325922. Its totient is φ = 123240325920.

The previous prime is 123240325867. The next prime is 123240325961. The reversal of 123240325921 is 129523042321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119428992225 + 3811333696 = 345585^2 + 61736^2 .

It is an emirp because it is prime and its reverse (129523042321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123240325921 - 2⁹ = 123240325409 is a prime.

It is a super-2 number, since 2×123240325921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123240325961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61620162960 + 61620162961.

It is an arithmetic number, because the mean of its divisors is an integer number (61620162961).

Almost surely, 2^123240325921 is an apocalyptic number.

It is an amenable number.

123240325921 is a deficient number, since it is larger than the sum of its proper divisors (1).

123240325921 is an equidigital number, since it uses as much as digits as its factorization.

123240325921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 123240325921 in words is "one hundred twenty-three billion, two hundred forty million, three hundred twenty-five thousand, nine hundred twenty-one".