213313121 has 6 divisors (see below), whose sum is σ = 248139810. Its totient is φ = 182839776.

The previous prime is 213313099. The next prime is 213313123. The reversal of 213313121 is 121313312.

It can be written as a sum of positive squares in only one way, i.e., 181953121 + 31360000 = 13489^2 + 5600^2 .

It is not a de Polignac number, because 213313121 - 2¹⁴ = 213296737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213313121.

It is not an unprimeable number, because it can be changed into a prime (213313123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2176616 + ... + 2176713.

It is an arithmetic number, because the mean of its divisors is an integer number (41356635).

Almost surely, 2^213313121 is an apocalyptic number.

It is an amenable number.

213313121 is a deficient number, since it is larger than the sum of its proper divisors (34826689).

213313121 is an equidigital number, since it uses as much as digits as its factorization.

213313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353343 (or 4353336 counting only the distinct ones).

The product of its digits is 108, while the sum is 17.

The square root of 213313121 is about 14605.2429284829. The cubic root of 213313121 is about 597.5017615186.

Adding to 213313121 its reverse (121313312), we get a palindrome (334626433).

The spelling of 213313121 in words is "two hundred thirteen million, three hundred thirteen thousand, one hundred twenty-one".