2321131221 has 10 divisors (see below), whose sum is σ = 3467368982. Its totient is φ = 1547420760.

The previous prime is 2321131217. The next prime is 2321131259. The reversal of 2321131221 is 1221311232.

2321131221 is digitally balanced in base 2, 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., 1721420100 + 599711121 = 41490^2 + 24489^2 .

It is not a de Polignac number, because 2321131221 - 2² = 2321131217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2321131194 and 2321131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2321131201) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14327890 + ... + 14328051.

Almost surely, 2^2321131221 is an apocalyptic number.

It is an amenable number.

2321131221 is a deficient number, since it is larger than the sum of its proper divisors (1146237761).

2321131221 is an equidigital number, since it uses as much as digits as its factorization.

2321131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28655953 (or 28655944 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2321131221 is about 48178.1197329244. The cubic root of 2321131221 is about 1324.0363176223.

Adding to 2321131221 its reverse (1221311232), we get a palindrome (3542442453).

The spelling of 2321131221 in words is "two billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".