31213430033231 has 4 divisors (see below), whose sum is σ = 31215368410512. Its totient is φ = 31211491655952.

The previous prime is 31213430033213. The next prime is 31213430033243. The reversal of 31213430033231 is 13233003431213.

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 31213430033231 - 2³⁴ = 31196250164047 is a prime.

It is a super-2 number, since 2×31213430033231² (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 = 31213430033194 and 31213430033203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213433033231) 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, 969164486 + ... + 969196691.

It is an arithmetic number, because the mean of its divisors is an integer number (7803842102628).

Almost surely, 2^{31213430033231} is an apocalyptic number.

31213430033231 is a deficient number, since it is larger than the sum of its proper divisors (1938377281).

31213430033231 is a wasteful number, since it uses less digits than its factorization.

31213430033231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938377280.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 31213430033231 its reverse (13233003431213), we get a palindrome (44446433464444).

The spelling of 31213430033231 in words is "thirty-one trillion, two hundred thirteen billion, four hundred thirty million, thirty-three thousand, two hundred thirty-one".