1232311221 has 12 divisors (see below), whose sum is σ = 1780618060. Its totient is φ = 821257920.

The previous prime is 1232311153. The next prime is 1232311231. The reversal of 1232311221 is 1221132321.

It can be written as a sum of positive squares in 2 ways, for example, as 436224996 + 796086225 = 20886^2 + 28215^2 .

It is not a de Polignac number, because 1232311221 - 2¹¹ = 1232309173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1232311194 and 1232311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232311231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5961 + ... + 50001.

Almost surely, 2^1232311221 is an apocalyptic number.

It is an amenable number.

1232311221 is a deficient number, since it is larger than the sum of its proper divisors (548306839).

1232311221 is a wasteful number, since it uses less digits than its factorization.

1232311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47156 (or 47153 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1232311221 is about 35104.2906351916. The cubic root of 1232311221 is about 1072.1119439815. Note that the first 3 decimals are identical.

Adding to 1232311221 its reverse (1221132321), we get a palindrome (2453443542).

The spelling of 1232311221 in words is "one billion, two hundred thirty-two million, three hundred eleven thousand, two hundred twenty-one".