313212421 has 4 divisors (see below), whose sum is σ = 314030592. Its totient is φ = 312394252.

The previous prime is 313212379. The next prime is 313212443. The reversal of 313212421 is 124212313.

It is a happy number.

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: 124212313 = 4877 ⋅25469.

It is a cyclic number.

It is not a de Polignac number, because 313212421 - 2⁹ = 313211909 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 (313212721) 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, 408511 + ... + 409276.

It is an arithmetic number, because the mean of its divisors is an integer number (78507648).

Almost surely, 2^313212421 is an apocalyptic number.

It is an amenable number.

313212421 is a deficient number, since it is larger than the sum of its proper divisors (818171).

313212421 is an equidigital number, since it uses as much as digits as its factorization.

313212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818170.

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

The square root of 313212421 is about 17697.8083671397. The cubic root of 313212421 is about 679.1196949327.

Adding to 313212421 its reverse (124212313), we get a palindrome (437424734).

The spelling of 313212421 in words is "three hundred thirteen million, two hundred twelve thousand, four hundred twenty-one".