313312221 has 12 divisors (see below), whose sum is σ = 452843872. Its totient is φ = 208744776.

The previous prime is 313312217. The next prime is 313312247. The reversal of 313312221 is 122213313.

It is not a de Polignac number, because 313312221 - 2² = 313312217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313312194 and 313312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313312271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5760 + ... + 25686.

Almost surely, 2^313312221 is an apocalyptic number.

It is an amenable number.

313312221 is a deficient number, since it is larger than the sum of its proper divisors (139531651).

313312221 is a wasteful number, since it uses less digits than its factorization.

313312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680 (or 21677 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 313312221 is about 17700.6277007342. The cubic root of 313312221 is about 679.1918173899.

Adding to 313312221 its reverse (122213313), we get a palindrome (435525534).

The spelling of 313312221 in words is "three hundred thirteen million, three hundred twelve thousand, two hundred twenty-one".