2131233221 has 8 divisors (see below), whose sum is σ = 2295581400. Its totient is φ = 1966943232.

The previous prime is 2131233157. The next prime is 2131233241. The reversal of 2131233221 is 1223321312.

It can be written as a sum of positive squares in 4 ways, for example, as 239940100 + 1891293121 = 15490^2 + 43489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2131233221 - 2⁶ = 2131233157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2131233193 and 2131233202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131233241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88721 + ... + 110153.

It is an arithmetic number, because the mean of its divisors is an integer number (286947675).

Almost surely, 2^2131233221 is an apocalyptic number.

It is an amenable number.

2131233221 is a deficient number, since it is larger than the sum of its proper divisors (164348179).

2131233221 is a wasteful number, since it uses less digits than its factorization.

2131233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29095.

The product of its digits is 432, while the sum is 20.

The square root of 2131233221 is about 46165.2815544322. The cubic root of 2131233221 is about 1286.8966165821.

Adding to 2131233221 its reverse (1223321312), we get a palindrome (3354554533).

The spelling of 2131233221 in words is "two billion, one hundred thirty-one million, two hundred thirty-three thousand, two hundred twenty-one".