31212000013231 has 6 divisors (see below), whose sum is σ = 31812017104280. Its totient is φ = 30623094349848.

The previous prime is 31212000013213. The next prime is 31212000013267. The reversal of 31212000013231 is 13231000021213.

It is not a de Polignac number, because 31212000013231 - 2¹¹ = 31212000011183 is a prime.

It is a super-2 number, since 2×31212000013231² (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 = 31212000013199 and 31212000013208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212000010231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5555710971 + ... + 5555716588.

Almost surely, 2^{31212000013231} is an apocalyptic number.

31212000013231 is a deficient number, since it is larger than the sum of its proper divisors (600017091049).

31212000013231 is an equidigital number, since it uses as much as digits as its factorization.

31212000013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111427665 (or 11111427612 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31212000013231 its reverse (13231000021213), we get a palindrome (44443000034444).

The spelling of 31212000013231 in words is "thirty-one trillion, two hundred twelve billion, thirteen thousand, two hundred thirty-one".