123102240404021 has 4 divisors (see below), whose sum is σ = 123103262739072. Its totient is φ = 123101218068972.

The previous prime is 123102240403973. The next prime is 123102240404057. The reversal of 123102240404021 is 120404042201321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123102240404021 - 2⁶ = 123102240403957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123102240400021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510986885 + ... + 511227738.

It is an arithmetic number, because the mean of its divisors is an integer number (30775815684768).

Almost surely, 2^{123102240404021} is an apocalyptic number.

It is an amenable number.

123102240404021 is a deficient number, since it is larger than the sum of its proper divisors (1022335051).

123102240404021 is a wasteful number, since it uses less digits than its factorization.

123102240404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022335050.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 123102240404021 its reverse (120404042201321), we get a palindrome (243506282605342).

The spelling of 123102240404021 in words is "one hundred twenty-three trillion, one hundred two billion, two hundred forty million, four hundred four thousand, twenty-one".