31123212322321 has 16 divisors (see below), whose sum is σ = 35959676989824. Its totient is φ = 26384681700864.

The previous prime is 31123212322297. The next prime is 31123212322357. The reversal of 31123212322321 is 12322321232113.

It is a cyclic number.

It is not a de Polignac number, because 31123212322321 - 2³⁵ = 31088852583953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31123212322321.

It is not an unprimeable number, because it can be changed into a prime (31123212322421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14014090 + ... + 16082323.

It is an arithmetic number, because the mean of its divisors is an integer number (2247479811864).

Almost surely, 2^{31123212322321} is an apocalyptic number.

It is an amenable number.

31123212322321 is a deficient number, since it is larger than the sum of its proper divisors (4836464667503).

31123212322321 is a wasteful number, since it uses less digits than its factorization.

31123212322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30098040.

The product of its digits is 5184, while the sum is 28.

Adding to 31123212322321 its reverse (12322321232113), we get a palindrome (43445533554434).

The spelling of 31123212322321 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred twelve million, three hundred twenty-two thousand, three hundred twenty-one".