313421221 has 4 divisors (see below), whose sum is σ = 314491212. Its totient is φ = 312351232.

The previous prime is 313421209. The next prime is 313421237. The reversal of 313421221 is 122124313.

313421221 = 419² + 420² + ... + 1004².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122124313 = 263 ⋅464351.

It can be written as a sum of positive squares in 2 ways, for example, as 264225025 + 49196196 = 16255^2 + 7014^2 .

It is a cyclic number.

It is not a de Polignac number, because 313421221 - 2⁵ = 313421189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313421201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534556 + ... + 535141.

It is an arithmetic number, because the mean of its divisors is an integer number (78622803).

Almost surely, 2^313421221 is an apocalyptic number.

It is an amenable number.

313421221 is a deficient number, since it is larger than the sum of its proper divisors (1069991).

313421221 is a wasteful number, since it uses less digits than its factorization.

313421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069990.

The product of its digits is 288, while the sum is 19.

The square root of 313421221 is about 17703.7064198433. The cubic root of 313421221 is about 679.2705709140.

Adding to 313421221 its reverse (122124313), we get a palindrome (435545534).

The spelling of 313421221 in words is "three hundred thirteen million, four hundred twenty-one thousand, two hundred twenty-one".