312243421 has 4 divisors (see below), whose sum is σ = 356849632. Its totient is φ = 267637212.

The previous prime is 312243401. The next prime is 312243457. The reversal of 312243421 is 124342213.

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 a cyclic number.

It is not a de Polignac number, because 312243421 - 2⁷ = 312243293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312243392 and 312243401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312243401) 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, 22303095 + ... + 22303108.

It is an arithmetic number, because the mean of its divisors is an integer number (89212408).

Almost surely, 2^312243421 is an apocalyptic number.

It is an amenable number.

312243421 is a deficient number, since it is larger than the sum of its proper divisors (44606211).

312243421 is an equidigital number, since it uses as much as digits as its factorization.

312243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44606210.

The product of its digits is 1152, while the sum is 22.

The square root of 312243421 is about 17670.4108893936. The cubic root of 312243421 is about 678.4186299473.

Adding to 312243421 its reverse (124342213), we get a palindrome (436585634).

The spelling of 312243421 in words is "three hundred twelve million, two hundred forty-three thousand, four hundred twenty-one".