31020230213 has 4 divisors (see below), whose sum is σ = 35451691680. Its totient is φ = 26588768748.

The previous prime is 31020230201. The next prime is 31020230233. The reversal of 31020230213 is 31203202013.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31203202013 = 1153 ⋅27062621.

It is a cyclic number.

It is not a de Polignac number, because 31020230213 - 2²⁶ = 30953121349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31020230191 and 31020230200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020230233) 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, 2215730723 + ... + 2215730736.

It is an arithmetic number, because the mean of its divisors is an integer number (8862922920).

Almost surely, 2^31020230213 is an apocalyptic number.

It is an amenable number.

31020230213 is a deficient number, since it is larger than the sum of its proper divisors (4431461467).

31020230213 is an equidigital number, since it uses as much as digits as its factorization.

31020230213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431461466.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31020230213 its reverse (31203202013), we get a palindrome (62223432226).

The spelling of 31020230213 in words is "thirty-one billion, twenty million, two hundred thirty thousand, two hundred thirteen".