312103242221 has 4 divisors (see below), whose sum is σ = 312106960092. Its totient is φ = 312099524352.

The previous prime is 312103242193. The next prime is 312103242281. The reversal of 312103242221 is 122242301213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 141522678025 + 170580564196 = 376195^2 + 413014^2 .

It is a cyclic number.

It is not a de Polignac number, because 312103242221 - 2²² = 312099047917 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 (312103242281) 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, 1730036 + ... + 1901901.

It is an arithmetic number, because the mean of its divisors is an integer number (78026740023).

Almost surely, 2^312103242221 is an apocalyptic number.

It is an amenable number.

312103242221 is a deficient number, since it is larger than the sum of its proper divisors (3717871).

312103242221 is an equidigital number, since it uses as much as digits as its factorization.

312103242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717870.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 312103242221 its reverse (122242301213), we get a palindrome (434345543434).

The spelling of 312103242221 in words is "three hundred twelve billion, one hundred three million, two hundred forty-two thousand, two hundred twenty-one".