31203021213 has 48 divisors (see below), whose sum is σ = 55871320960. Its totient is φ = 16340268672.

The previous prime is 31203021211. The next prime is 31203021293. The reversal of 31203021213 is 31212030213.

It is not a de Polignac number, because 31203021213 - 2¹ = 31203021211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203021211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23206 + ... + 250887.

Almost surely, 2^31203021213 is an apocalyptic number.

It is an amenable number.

31203021213 is a deficient number, since it is larger than the sum of its proper divisors (24668299747).

31203021213 is a wasteful number, since it uses less digits than its factorization.

31203021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274258 (or 274255 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31203021213 its reverse (31212030213), we get a palindrome (62415051426).

The spelling of 31203021213 in words is "thirty-one billion, two hundred three million, twenty-one thousand, two hundred thirteen".