31312222212321 has 12 divisors (see below), whose sum is σ = 45228835709460. Its totient is φ = 20874782365920.

The previous prime is 31312222212307. The next prime is 31312222212361. The reversal of 31312222212321 is 12321222221313.

31312222212321 is a `hidden beast` number, since 3 + 1 + 3 + 122 + 2 + 2 + 212 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27240257408400 + 4071964803921 = 5219220^2 + 2017911^2 .

It is not a de Polignac number, because 31312222212321 - 2⁵ = 31312222212289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31312222212361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4388311 + ... + 9048851.

It is an arithmetic number, because the mean of its divisors is an integer number (3769069642455).

Almost surely, 2^{31312222212321} is an apocalyptic number.

It is an amenable number.

31312222212321 is a deficient number, since it is larger than the sum of its proper divisors (13916613497139).

31312222212321 is a wasteful number, since it uses less digits than its factorization.

31312222212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407056 (or 5407053 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 31312222212321 its reverse (12321222221313), we get a palindrome (43633444433634).

The spelling of 31312222212321 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, three hundred twenty-one".