312332240321221 has 4 divisors (see below), whose sum is σ = 314137628993772. Its totient is φ = 310526851648672.

The previous prime is 312332240321207. The next prime is 312332240321251. The reversal of 312332240321221 is 122123042233213.

It is a happy number.

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 111382166750625 + 200950073570596 = 10553775^2 + 14175686^2 .

It is a cyclic number.

It is not a de Polignac number, because 312332240321221 - 2⁷ = 312332240321093 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 (312332240321251) 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, 902694336016 + ... + 902694336361.

It is an arithmetic number, because the mean of its divisors is an integer number (78534407248443).

Almost surely, 2^{312332240321221} is an apocalyptic number.

It is an amenable number.

312332240321221 is a deficient number, since it is larger than the sum of its proper divisors (1805388672551).

312332240321221 is a wasteful number, since it uses less digits than its factorization.

312332240321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805388672550.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 312332240321221 its reverse (122123042233213), we get a palindrome (434455282554434).

The spelling of 312332240321221 in words is "three hundred twelve trillion, three hundred thirty-two billion, two hundred forty million, three hundred twenty-one thousand, two hundred twenty-one".