231144424021 has 4 divisors (see below), whose sum is σ = 264165056032. Its totient is φ = 198123792012.

The previous prime is 231144423997. The next prime is 231144424081. The reversal of 231144424021 is 120424441132.

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 231144424021 - 2⁷ = 231144423893 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 (231144424081) 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, 16510315995 + ... + 16510316008.

It is an arithmetic number, because the mean of its divisors is an integer number (66041264008).

Almost surely, 2^231144424021 is an apocalyptic number.

It is an amenable number.

231144424021 is a deficient number, since it is larger than the sum of its proper divisors (33020632011).

231144424021 is an equidigital number, since it uses as much as digits as its factorization.

231144424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33020632010.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 231144424021 its reverse (120424441132), we get a palindrome (351568865153).

The spelling of 231144424021 in words is "two hundred thirty-one billion, one hundred forty-four million, four hundred twenty-four thousand, twenty-one".