313212021 has 4 divisors (see below), whose sum is σ = 417616032. Its totient is φ = 208808012.

The previous prime is 313212001. The next prime is 313212041. The reversal of 313212021 is 120212313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (313212001) and next prime (313212041).

It is a cyclic number.

It is not a de Polignac number, because 313212021 - 2⁵ = 313211989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313212001) 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, 52202001 + ... + 52202006.

It is an arithmetic number, because the mean of its divisors is an integer number (104404008).

Almost surely, 2^313212021 is an apocalyptic number.

It is an amenable number.

313212021 is a deficient number, since it is larger than the sum of its proper divisors (104404011).

313212021 is a wasteful number, since it uses less digits than its factorization.

313212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104404010.

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

The square root of 313212021 is about 17697.7970663018. The cubic root of 313212021 is about 679.1194058339.

Adding to 313212021 its reverse (120212313), we get a palindrome (433424334).

The spelling of 313212021 in words is "three hundred thirteen million, two hundred twelve thousand, twenty-one".