31212122323331 has 4 divisors (see below), whose sum is σ = 31218336169152. Its totient is φ = 31205908477512.

The previous prime is 31212122323309. The next prime is 31212122323373. The reversal of 31212122323331 is 13332322121213.

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

It is a cyclic number.

It is not a de Polignac number, because 31212122323331 - 2²⁶ = 31212055214467 is a prime.

It is a super-2 number, since 2×31212122323331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212122323294 and 31212122323303.

It is not an unprimeable number, because it can be changed into a prime (31212122323931) 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 3 ways as a sum of consecutive naturals, for example, 3106915376 + ... + 3106925421.

It is an arithmetic number, because the mean of its divisors is an integer number (7804584042288).

Almost surely, 2^{31212122323331} is an apocalyptic number.

31212122323331 is a deficient number, since it is larger than the sum of its proper divisors (6213845821).

31212122323331 is an equidigital number, since it uses as much as digits as its factorization.

31212122323331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213845820.

The product of its digits is 7776, while the sum is 29.

Adding to 31212122323331 its reverse (13332322121213), we get a palindrome (44544444444544).

The spelling of 31212122323331 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-two million, three hundred twenty-three thousand, three hundred thirty-one".