123242510121421 has 4 divisors (see below), whose sum is σ = 124212923587072. Its totient is φ = 122272096655772.

The previous prime is 123242510121383. The next prime is 123242510121449. The reversal of 123242510121421 is 124121015242321.

It is a happy number.

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 123242510121421 - 2⁷ = 123242510121293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123242510121491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485206732635 + ... + 485206732888.

It is an arithmetic number, because the mean of its divisors is an integer number (31053230896768).

Almost surely, 2^{123242510121421} is an apocalyptic number.

It is an amenable number.

123242510121421 is a deficient number, since it is larger than the sum of its proper divisors (970413465651).

123242510121421 is an equidigital number, since it uses as much as digits as its factorization.

123242510121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970413465650.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 123242510121421 its reverse (124121015242321), we get a palindrome (247363525363742).

The spelling of 123242510121421 in words is "one hundred twenty-three trillion, two hundred forty-two billion, five hundred ten million, one hundred twenty-one thousand, four hundred twenty-one".