1221433205 has 8 divisors (see below), whose sum is σ = 1466233272. Its totient is φ = 976804288.

The previous prime is 1221433123. The next prime is 1221433207. The reversal of 1221433205 is 5023341221.

It can be written as a sum of positive squares in 4 ways, for example, as 98446084 + 1122987121 = 9922^2 + 33511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221433205 - 2²⁶ = 1154324341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221433207) 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 7 ways as a sum of consecutive naturals, for example, 26522 + ... + 56091.

It is an arithmetic number, because the mean of its divisors is an integer number (183279159).

Almost surely, 2^1221433205 is an apocalyptic number.

It is an amenable number.

1221433205 is a deficient number, since it is larger than the sum of its proper divisors (244800067).

1221433205 is an equidigital number, since it uses as much as digits as its factorization.

1221433205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85575.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1221433205 is about 34949.0086411618. The cubic root of 1221433205 is about 1068.9479877607.

Adding to 1221433205 its reverse (5023341221), we get a palindrome (6244774426).

The spelling of 1221433205 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, two hundred five".