2231322221 has 2 divisors, whose sum is σ = 2231322222. Its totient is φ = 2231322220.

The previous prime is 2231322211. The next prime is 2231322337. The reversal of 2231322221 is 1222231322.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990141321 + 241180900 = 44611^2 + 15530^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231322221 - 2⁶ = 2231322157 is a prime.

It is a super-3 number, since 3×2231322221³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2231322193 and 2231322202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231322211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115661110 + 1115661111.

It is an arithmetic number, because the mean of its divisors is an integer number (1115661111).

Almost surely, 2^2231322221 is an apocalyptic number.

It is an amenable number.

2231322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231322221 is an equidigital number, since it uses as much as digits as its factorization.

2231322221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 20.

The square root of 2231322221 is about 47236.8735311727. The cubic root of 2231322221 is about 1306.7347190178.

Adding to 2231322221 its reverse (1222231322), we get a palindrome (3453553543).

The spelling of 2231322221 in words is "two billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty-one".