123102240400021 has 2 divisors, whose sum is σ = 123102240400022. Its totient is φ = 123102240400020.

The previous prime is 123102240399917. The next prime is 123102240400039. The reversal of 123102240400021 is 120004042201321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110702193723121 + 12400046676900 = 10521511^2 + 3521370^2 .

It is a cyclic number.

It is not a de Polignac number, because 123102240400021 - 2²⁵ = 123102206845589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123102240399965 and 123102240400001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123102240400721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61551120200010 + 61551120200011.

It is an arithmetic number, because the mean of its divisors is an integer number (61551120200011).

Almost surely, 2^{123102240400021} is an apocalyptic number.

It is an amenable number.

123102240400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123102240400021 is an equidigital number, since it uses as much as digits as its factorization.

123102240400021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 123102240400021 its reverse (120004042201321), we get a palindrome (243106282601342).

The spelling of 123102240400021 in words is "one hundred twenty-three trillion, one hundred two billion, two hundred forty million, four hundred thousand, twenty-one".