312110121221 has 4 divisors (see below), whose sum is σ = 319722563244. Its totient is φ = 304497679200.

The previous prime is 312110121151. The next prime is 312110121227. The reversal of 312110121221 is 122121011213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122121011213 = 1051 ⋅116195063.

It can be written as a sum of positive squares in 2 ways, for example, as 81219300100 + 230890821121 = 284990^2 + 480511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312110121221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312110121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312110121227) 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, 3806220950 + ... + 3806221031.

It is an arithmetic number, because the mean of its divisors is an integer number (79930640811).

Almost surely, 2^312110121221 is an apocalyptic number.

It is an amenable number.

312110121221 is a deficient number, since it is larger than the sum of its proper divisors (7612442023).

312110121221 is an equidigital number, since it uses as much as digits as its factorization.

312110121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7612442022.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 312110121221 its reverse (122121011213), we get a palindrome (434231132434).

The spelling of 312110121221 in words is "three hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".