1232222221 has 2 divisors, whose sum is σ = 1232222222. Its totient is φ = 1232222220.

The previous prime is 1232222179. The next prime is 1232222227. The reversal of 1232222221 is 1222222321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702992196 + 529230025 = 26514^2 + 23005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232222221 - 2²¹ = 1230125069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616111110 + 616111111.

It is an arithmetic number, because the mean of its divisors is an integer number (616111111).

Almost surely, 2^1232222221 is an apocalyptic number.

It is an amenable number.

1232222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232222221 is an equidigital number, since it uses as much as digits as its factorization.

1232222221 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 1232222221 is about 35103.0229609930. The cubic root of 1232222221 is about 1072.0861333317.

Adding to 1232222221 its reverse (1222222321), we get a palindrome (2454444542).

It can be divided in two parts, 12322 and 22221, that added together give a palindrome (34543).

The spelling of 1232222221 in words is "one billion, two hundred thirty-two million, two hundred twenty-two thousand, two hundred twenty-one".