1232211221 has 4 divisors (see below), whose sum is σ = 1304694252. Its totient is φ = 1159728192.

The previous prime is 1232211209. The next prime is 1232211229. The reversal of 1232211221 is 1221122321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 419676196 + 812535025 = 20486^2 + 28505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232211221 - 2²² = 1228016917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 72483013 = 1232211221 / (1 + 2 + 3 + 2 + 2 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1232211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232211229) 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 3 ways as a sum of consecutive naturals, for example, 36241490 + ... + 36241523.

It is an arithmetic number, because the mean of its divisors is an integer number (326173563).

Almost surely, 2^1232211221 is an apocalyptic number.

It is an amenable number.

1232211221 is a deficient number, since it is larger than the sum of its proper divisors (72483031).

1232211221 is an equidigital number, since it uses as much as digits as its factorization.

1232211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72483030.

The product of its digits is 96, while the sum is 17.

The square root of 1232211221 is about 35102.8662789807. The cubic root of 1232211221 is about 1072.0829431651.

Adding to 1232211221 its reverse (1221122321), we get a palindrome (2453333542).

Subtracting from 1232211221 its reverse (1221122321), we obtain a square (11088900 = 3330²).

The spelling of 1232211221 in words is "one billion, two hundred thirty-two million, two hundred eleven thousand, two hundred twenty-one".