1213233221 has 4 divisors (see below), whose sum is σ = 1213713600. Its totient is φ = 1212752844.

The previous prime is 1213233211. The next prime is 1213233227. The reversal of 1213233221 is 1223323121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213233221 - 2²² = 1209038917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213233193 and 1213233202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213233227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236381 + ... + 241458.

It is an arithmetic number, because the mean of its divisors is an integer number (303428400).

Almost surely, 2^1213233221 is an apocalyptic number.

It is an amenable number.

1213233221 is a deficient number, since it is larger than the sum of its proper divisors (480379).

1213233221 is an equidigital number, since it uses as much as digits as its factorization.

1213233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480378.

The product of its digits is 432, while the sum is 20.

The square root of 1213233221 is about 34831.4975417366. The cubic root of 1213233221 is about 1066.5505186792.

Adding to 1213233221 its reverse (1223323121), we get a palindrome (2436556342).

The spelling of 1213233221 in words is "one billion, two hundred thirteen million, two hundred thirty-three thousand, two hundred twenty-one".