2131330221 has 6 divisors (see below), whose sum is σ = 3078588110. Its totient is φ = 1420886808.

The previous prime is 2131330199. The next prime is 2131330231. The reversal of 2131330221 is 1220331312.

2131330221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1911875625 + 219454596 = 43725^2 + 14814^2 .

It is not a de Polignac number, because 2131330221 - 2⁷ = 2131330093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131330194 and 2131330203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131330231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118407226 + ... + 118407243.

Almost surely, 2^2131330221 is an apocalyptic number.

It is an amenable number.

2131330221 is a deficient number, since it is larger than the sum of its proper divisors (947257889).

2131330221 is a wasteful number, since it uses less digits than its factorization.

2131330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236814475 (or 236814472 counting only the distinct ones).

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

The square root of 2131330221 is about 46166.3321155147. The cubic root of 2131330221 is about 1286.9161400324.

Adding to 2131330221 its reverse (1220331312), we get a palindrome (3351661533).

The spelling of 2131330221 in words is "two billion, one hundred thirty-one million, three hundred thirty thousand, two hundred twenty-one".