2232221221 has 2 divisors, whose sum is σ = 2232221222. Its totient is φ = 2232221220.

The previous prime is 2232221207. The next prime is 2232221237. The reversal of 2232221221 is 1221222322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1915025121 + 317196100 = 43761^2 + 17810^2 .

It is a cyclic number.

It is not a de Polignac number, because 2232221221 - 2¹⁷ = 2232090149 is a prime.

It is a super-3 number, since 3×2232221221³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2232221021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1116110610 + 1116110611.

It is an arithmetic number, because the mean of its divisors is an integer number (1116110611).

Almost surely, 2^2232221221 is an apocalyptic number.

It is an amenable number.

2232221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2232221221 is an equidigital number, since it uses as much as digits as its factorization.

2232221221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 19.

The square root of 2232221221 is about 47246.3884439859. The cubic root of 2232221221 is about 1306.9101899810.

Adding to 2232221221 its reverse (1221222322), we get a palindrome (3453443543).

The spelling of 2232221221 in words is "two billion, two hundred thirty-two million, two hundred twenty-one thousand, two hundred twenty-one".