31033023213 has 4 divisors (see below), whose sum is σ = 41377364288. Its totient is φ = 20688682140.

The previous prime is 31033023193. The next prime is 31033023257. The reversal of 31033023213 is 31232033013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31033023213 - 2⁵ = 31033023181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31033023213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033023313) 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, 5172170533 + ... + 5172170538.

It is an arithmetic number, because the mean of its divisors is an integer number (10344341072).

Almost surely, 2^31033023213 is an apocalyptic number.

It is an amenable number.

31033023213 is a deficient number, since it is larger than the sum of its proper divisors (10344341075).

31033023213 is a wasteful number, since it uses less digits than its factorization.

31033023213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344341074.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31033023213 its reverse (31232033013), we get a palindrome (62265056226).

The spelling of 31033023213 in words is "thirty-one billion, thirty-three million, twenty-three thousand, two hundred thirteen".