31212443311431 has 32 divisors (see below), whose sum is σ = 44116248038400. Its totient is φ = 19561338570240.

The previous prime is 31212443311429. The next prime is 31212443311531. The reversal of 31212443311431 is 13411334421213.

It is a happy number.

It is not a de Polignac number, because 31212443311431 - 2¹ = 31212443311429 is a prime.

It is a super-2 number, since 2×31212443311431² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212443311392 and 31212443311401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212443311531) 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 31 ways as a sum of consecutive naturals, for example, 823984950 + ... + 824022828.

It is an arithmetic number, because the mean of its divisors is an integer number (1378632751200).

Almost surely, 2^{31212443311431} is an apocalyptic number.

31212443311431 is a deficient number, since it is larger than the sum of its proper divisors (12903804726969).

31212443311431 is a wasteful number, since it uses less digits than its factorization.

31212443311431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56399.

The product of its digits is 20736, while the sum is 33.

Adding to 31212443311431 its reverse (13411334421213), we get a palindrome (44623777732644).

The spelling of 31212443311431 in words is "thirty-one trillion, two hundred twelve billion, four hundred forty-three million, three hundred eleven thousand, four hundred thirty-one".