431223221 has 32 divisors (see below), whose sum is σ = 545825280. Its totient is φ = 334756800.

The previous prime is 431223217. The next prime is 431223223. The reversal of 431223221 is 122322134.

It is a cyclic number.

It is not a de Polignac number, because 431223221 - 2² = 431223217 is a prime.

It is a super-2 number, since 2×431223221² = 371906932659229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 431223193 and 431223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431223223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114986 + ... + 118676.

It is an arithmetic number, because the mean of its divisors is an integer number (17057040).

Almost surely, 2^431223221 is an apocalyptic number.

It is an amenable number.

431223221 is a deficient number, since it is larger than the sum of its proper divisors (114602059).

431223221 is a wasteful number, since it uses less digits than its factorization.

431223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777.

The product of its digits is 576, while the sum is 20.

The square root of 431223221 is about 20765.9148847336. The cubic root of 431223221 is about 755.4992654054.

Adding to 431223221 its reverse (122322134), we get a palindrome (553545355).

The spelling of 431223221 in words is "four hundred thirty-one million, two hundred twenty-three thousand, two hundred twenty-one".