2031720213 has 16 divisors (see below), whose sum is σ = 2742681600. Its totient is φ = 1337656320.

The previous prime is 2031720181. The next prime is 2031720227. The reversal of 2031720213 is 3120271302.

It is not a de Polignac number, because 2031720213 - 2⁵ = 2031720181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2031720213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031720233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243948 + ... + 252138.

It is an arithmetic number, because the mean of its divisors is an integer number (171417600).

Almost surely, 2^2031720213 is an apocalyptic number.

It is an amenable number.

2031720213 is a deficient number, since it is larger than the sum of its proper divisors (710961387).

2031720213 is an equidigital number, since it uses as much as digits as its factorization.

2031720213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2031720213 is about 45074.6071863083. The cubic root of 2031720213 is about 1266.5469704607.

Adding to 2031720213 its reverse (3120271302), we get a palindrome (5151991515).

The spelling of 2031720213 in words is "two billion, thirty-one million, seven hundred twenty thousand, two hundred thirteen".