1242372732421 has 4 divisors (see below), whose sum is σ = 1285213171500. Its totient is φ = 1199532293344.

The previous prime is 1242372732389. The next prime is 1242372732449.

1242372732421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359310330625 + 883062401796 = 599425^2 + 939714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242372732421 - 2⁵ = 1242372732389 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 (1242372712421) 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, 21420219496 + ... + 21420219553.

It is an arithmetic number, because the mean of its divisors is an integer number (321303292875).

Almost surely, 2^{1242372732421} is an apocalyptic number.

It is an amenable number.

1242372732421 is a deficient number, since it is larger than the sum of its proper divisors (42840439079).

1242372732421 is an equidigital number, since it uses as much as digits as its factorization.

1242372732421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42840439078.

The product of its digits is 225792, while the sum is 40.

The spelling of 1242372732421 in words is "one trillion, two hundred forty-two billion, three hundred seventy-two million, seven hundred thirty-two thousand, four hundred twenty-one".