313213421 has 4 divisors (see below), whose sum is σ = 316254432. Its totient is φ = 310172412.

The previous prime is 313213357. The next prime is 313213489. The reversal of 313213421 is 124312313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124312313 = 17 ⋅7312489.

It is a cyclic number.

It is not a de Polignac number, because 313213421 - 2⁶ = 313213357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313213393 and 313213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313213721) 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, 1520351 + ... + 1520556.

It is an arithmetic number, because the mean of its divisors is an integer number (79063608).

Almost surely, 2^313213421 is an apocalyptic number.

It is an amenable number.

313213421 is a deficient number, since it is larger than the sum of its proper divisors (3041011).

313213421 is a wasteful number, since it uses less digits than its factorization.

313213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041010.

The product of its digits is 432, while the sum is 20.

The square root of 313213421 is about 17697.8366192029. The cubic root of 313213421 is about 679.1204176786.

Adding to 313213421 its reverse (124312313), we get a palindrome (437525734).

The spelling of 313213421 in words is "three hundred thirteen million, two hundred thirteen thousand, four hundred twenty-one".