2031221313 has 24 divisors (see below), whose sum is σ = 3307656800. Its totient is φ = 1231041240.

The previous prime is 2031221299. The next prime is 2031221329. The reversal of 2031221313 is 3131221302.

2031221313 is a `hidden beast` number, since 20 + 312 + 21 + 313 = 666.

It is not a de Polignac number, because 2031221313 - 2⁹ = 2031220801 is a prime.

It is a super-3 number, since 3×2031221313³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2031221383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307603 + ... + 314136.

Almost surely, 2^2031221313 is an apocalyptic number.

It is an amenable number.

2031221313 is a deficient number, since it is larger than the sum of its proper divisors (1276435487).

2031221313 is a wasteful number, since it uses less digits than its factorization.

2031221313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621770 (or 621753 counting only the distinct ones).

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

The square root of 2031221313 is about 45069.0726884856. The cubic root of 2031221313 is about 1266.4432927977.

Adding to 2031221313 its reverse (3131221302), we get a palindrome (5162442615).

The spelling of 2031221313 in words is "two billion, thirty-one million, two hundred twenty-one thousand, three hundred thirteen".