313220121 has 16 divisors (see below), whose sum is σ = 448426368. Its totient is φ = 193760000.

The previous prime is 313220099. The next prime is 313220123. The reversal of 313220121 is 121022313.

It is a cyclic number.

It is not a de Polignac number, because 313220121 - 2¹⁵ = 313187353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313220121.

It is not an unprimeable number, because it can be changed into a prime (313220123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39630 + ... + 46871.

It is an arithmetic number, because the mean of its divisors is an integer number (28026648).

Almost surely, 2^313220121 is an apocalyptic number.

It is an amenable number.

313220121 is a deficient number, since it is larger than the sum of its proper divisors (135206247).

313220121 is a wasteful number, since it uses less digits than its factorization.

313220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86592.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 313220121 is about 17698.0259068632. The cubic root of 313220121 is about 679.1252600364.

Adding to 313220121 its reverse (121022313), we get a palindrome (434242434).

The spelling of 313220121 in words is "three hundred thirteen million, two hundred twenty thousand, one hundred twenty-one".