312221223 has 28 divisors (see below), whose sum is σ = 469815120. Its totient is φ = 207393696.

The previous prime is 312221209. The next prime is 312221227. The reversal of 312221223 is 322122213.

It is not a de Polignac number, because 312221223 - 2⁸ = 312220967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312221196 and 312221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312221227) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 261115 + ... + 262307.

Almost surely, 2^312221223 is an apocalyptic number.

312221223 is a deficient number, since it is larger than the sum of its proper divisors (157593897).

312221223 is an equidigital number, since it uses as much as digits as its factorization.

312221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570 (or 1555 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 312221223 is about 17669.7827660670. The cubic root of 312221223 is about 678.4025528606.

Adding to 312221223 its reverse (322122213), we get a palindrome (634343436).

The spelling of 312221223 in words is "three hundred twelve million, two hundred twenty-one thousand, two hundred twenty-three".