312203213 has 4 divisors (see below), whose sum is σ = 356803680. Its totient is φ = 267602748.

The previous prime is 312203207. The next prime is 312203267. The reversal of 312203213 is 312302213.

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: 312302213 = 619 ⋅504527.

It is a de Polignac number, because none of the positive numbers 2^k-312203213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312203191 and 312203200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312203413) 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, 22300223 + ... + 22300236.

It is an arithmetic number, because the mean of its divisors is an integer number (89200920).

Almost surely, 2^312203213 is an apocalyptic number.

It is an amenable number.

312203213 is a deficient number, since it is larger than the sum of its proper divisors (44600467).

312203213 is an equidigital number, since it uses as much as digits as its factorization.

312203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44600466.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 312203213 is about 17669.2731316260. The cubic root of 312203213 is about 678.3895084079.

Adding to 312203213 its reverse (312302213), we get a palindrome (624505426).

The spelling of 312203213 in words is "three hundred twelve million, two hundred three thousand, two hundred thirteen".