313211021 has 4 divisors (see below), whose sum is σ = 313625532. Its totient is φ = 312796512.

The previous prime is 313210981. The next prime is 313211053. The reversal of 313211021 is 120112313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69538921 + 243672100 = 8339^2 + 15610^2 .

It is a cyclic number.

It is not a de Polignac number, because 313211021 - 2¹⁰ = 313209997 is a prime.

It is a super-2 number, since 2×313211021² = 196202287351724882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313210987 and 313211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313261021) 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, 206120 + ... + 207633.

It is an arithmetic number, because the mean of its divisors is an integer number (78406383).

Almost surely, 2^313211021 is an apocalyptic number.

It is an amenable number.

313211021 is a deficient number, since it is larger than the sum of its proper divisors (414511).

313211021 is an equidigital number, since it uses as much as digits as its factorization.

313211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414510.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 313211021 is about 17697.7688141754. The cubic root of 313211021 is about 679.1186830859.

Adding to 313211021 its reverse (120112313), we get a palindrome (433323334).

The spelling of 313211021 in words is "three hundred thirteen million, two hundred eleven thousand, twenty-one".