2031113221 has 4 divisors (see below), whose sum is σ = 2031694252. Its totient is φ = 2030532192.

The previous prime is 2031113207. The next prime is 2031113251. The reversal of 2031113221 is 1223111302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1285222500 + 745890721 = 35850^2 + 27311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031113221 - 2¹³ = 2031105029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031113195 and 2031113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031113251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285240 + ... + 292273.

It is an arithmetic number, because the mean of its divisors is an integer number (507923563).

Almost surely, 2^2031113221 is an apocalyptic number.

It is an amenable number.

2031113221 is a deficient number, since it is larger than the sum of its proper divisors (581031).

2031113221 is an equidigital number, since it uses as much as digits as its factorization.

2031113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581030.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2031113221 is about 45067.8734909913. The cubic root of 2031113221 is about 1266.4208276899.

Adding to 2031113221 its reverse (1223111302), we get a palindrome (3254224523).

The spelling of 2031113221 in words is "two billion, thirty-one million, one hundred thirteen thousand, two hundred twenty-one".