312021113 has 4 divisors (see below), whose sum is σ = 312083280. Its totient is φ = 311958948.

The previous prime is 312021091. The next prime is 312021131. The reversal of 312021113 is 311120213.

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 a de Polignac number, because none of the positive numbers 2^k-312021113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (312021133) 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, 22823 + ... + 33836.

It is an arithmetic number, because the mean of its divisors is an integer number (78020820).

Almost surely, 2^312021113 is an apocalyptic number.

It is an amenable number.

312021113 is a deficient number, since it is larger than the sum of its proper divisors (62167).

312021113 is an equidigital number, since it uses as much as digits as its factorization.

312021113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62166.

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

The square root of 312021113 is about 17664.1193666710. The cubic root of 312021113 is about 678.2575871140.

Adding to 312021113 its reverse (311120213), we get a palindrome (623141326).

The spelling of 312021113 in words is "three hundred twelve million, twenty-one thousand, one hundred thirteen".