2031313021 has 4 divisors (see below), whose sum is σ = 2040422272. Its totient is φ = 2022203772.

The previous prime is 2031313019. The next prime is 2031313049. The reversal of 2031313021 is 1203131302.

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 a cyclic number.

It is not a de Polignac number, because 2031313021 - 2¹ = 2031313019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031312986 and 2031313004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031313001) 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, 4554291 + ... + 4554736.

It is an arithmetic number, because the mean of its divisors is an integer number (510105568).

Almost surely, 2^2031313021 is an apocalyptic number.

It is an amenable number.

2031313021 is a deficient number, since it is larger than the sum of its proper divisors (9109251).

2031313021 is an equidigital number, since it uses as much as digits as its factorization.

2031313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9109250.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 2031313021 is about 45070.0900930983. The cubic root of 2031313021 is about 1266.4623521411.

Adding to 2031313021 its reverse (1203131302), we get a palindrome (3234444323).

The spelling of 2031313021 in words is "two billion, thirty-one million, three hundred thirteen thousand, twenty-one".