4312431221 has 4 divisors (see below), whose sum is σ = 4928492832. Its totient is φ = 3696369612.

The previous prime is 4312431217. The next prime is 4312431241. The reversal of 4312431221 is 1221342134.

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 4312431221 - 2² = 4312431217 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 (4312431241) 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, 308030795 + ... + 308030808.

It is an arithmetic number, because the mean of its divisors is an integer number (1232123208).

Almost surely, 2^4312431221 is an apocalyptic number.

It is an amenable number.

4312431221 is a deficient number, since it is larger than the sum of its proper divisors (616061611).

4312431221 is an equidigital number, since it uses as much as digits as its factorization.

4312431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616061610.

The product of its digits is 1152, while the sum is 23.

The square root of 4312431221 is about 65669.1040063743. The cubic root of 4312431221 is about 1627.6988645335.

Adding to 4312431221 its reverse (1221342134), we get a palindrome (5533773355).

The spelling of 4312431221 in words is "four billion, three hundred twelve million, four hundred thirty-one thousand, two hundred twenty-one".