1232221221 has 96 divisors (see below), whose sum is σ = 2330711040. Its totient is φ = 625060800.

The previous prime is 1232221219. The next prime is 1232221247. The reversal of 1232221221 is 1221222321.

It is not a de Polignac number, because 1232221221 - 2¹ = 1232221219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1232221194 and 1232221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232221261) 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 in 95 ways as a sum of consecutive naturals, for example, 5839806 + ... + 5840016.

It is an arithmetic number, because the mean of its divisors is an integer number (24278240).

Almost surely, 2^1232221221 is an apocalyptic number.

1232221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1232221221 is a deficient number, since it is larger than the sum of its proper divisors (1098489819).

1232221221 is a wasteful number, since it uses less digits than its factorization.

1232221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 285 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1232221221 is about 35103.0087172026. The cubic root of 1232221221 is about 1072.0858433174.

Adding to 1232221221 its reverse (1221222321), we get a palindrome (2453443542).

The spelling of 1232221221 in words is "one billion, two hundred thirty-two million, two hundred twenty-one thousand, two hundred twenty-one".