123242504140021 has 4 divisors (see below), whose sum is σ = 140848576160032. Its totient is φ = 105636432120012.

The previous prime is 123242504140009. The next prime is 123242504140051. The reversal of 123242504140021 is 120041405242321.

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 123242504140021 - 2¹³ = 123242504131829 is a prime.

It is a super-3 number, since 3×123242504140021³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123242504140051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8803036009995 + ... + 8803036010008.

It is an arithmetic number, because the mean of its divisors is an integer number (35212144040008).

Almost surely, 2^{123242504140021} is an apocalyptic number.

It is an amenable number.

123242504140021 is a deficient number, since it is larger than the sum of its proper divisors (17606072020011).

123242504140021 is an equidigital number, since it uses as much as digits as its factorization.

123242504140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17606072020010.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 123242504140021 its reverse (120041405242321), we get a palindrome (243283909382342).

The spelling of 123242504140021 in words is "one hundred twenty-three trillion, two hundred forty-two billion, five hundred four million, one hundred forty thousand, twenty-one".