31214243213231 has 4 divisors (see below), whose sum is σ = 33615338845032. Its totient is φ = 28813147581432.

The previous prime is 31214243213227. The next prime is 31214243213267. The reversal of 31214243213231 is 13231234241213.

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 31214243213231 - 2² = 31214243213227 is a prime.

It is a super-2 number, since 2×31214243213231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31214243213731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200547815881 + ... + 1200547815906.

It is an arithmetic number, because the mean of its divisors is an integer number (8403834711258).

Almost surely, 2^{31214243213231} is an apocalyptic number.

31214243213231 is a deficient number, since it is larger than the sum of its proper divisors (2401095631801).

31214243213231 is a wasteful number, since it uses less digits than its factorization.

31214243213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401095631800.

The product of its digits is 20736, while the sum is 32.

Adding to 31214243213231 its reverse (13231234241213), we get a palindrome (44445477454444).

The spelling of 31214243213231 in words is "thirty-one trillion, two hundred fourteen billion, two hundred forty-three million, two hundred thirteen thousand, two hundred thirty-one".