431212321 has 4 divisors (see below), whose sum is σ = 431277444. Its totient is φ = 431147200.

The previous prime is 431212283. The next prime is 431212363. The reversal of 431212321 is 123212134.

It is a happy number.

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 160149025 + 271063296 = 12655^2 + 16464^2 .

It is a cyclic number.

It is not a de Polignac number, because 431212321 - 2¹⁹ = 430688033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431212121) 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, 21340 + ... + 36301.

It is an arithmetic number, because the mean of its divisors is an integer number (107819361).

Almost surely, 2^431212321 is an apocalyptic number.

It is an amenable number.

431212321 is a deficient number, since it is larger than the sum of its proper divisors (65123).

431212321 is an equidigital number, since it uses as much as digits as its factorization.

431212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65122.

The product of its digits is 288, while the sum is 19.

The square root of 431212321 is about 20765.6524337667. The cubic root of 431212321 is about 755.4928997840.

Adding to 431212321 its reverse (123212134), we get a palindrome (554424455).

The spelling of 431212321 in words is "four hundred thirty-one million, two hundred twelve thousand, three hundred twenty-one".