1223316221 has 4 divisors (see below), whose sum is σ = 1253153244. Its totient is φ = 1193479200.

The previous prime is 1223316187. The next prime is 1223316223. The reversal of 1223316221 is 1226133221.

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 379704196 + 843612025 = 19486^2 + 29045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223316221 - 2²⁶ = 1156207357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223316223) 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 3 ways as a sum of consecutive naturals, for example, 14918450 + ... + 14918531.

It is an arithmetic number, because the mean of its divisors is an integer number (313288311).

Almost surely, 2^1223316221 is an apocalyptic number.

It is an amenable number.

1223316221 is a deficient number, since it is larger than the sum of its proper divisors (29837023).

1223316221 is an equidigital number, since it uses as much as digits as its factorization.

1223316221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29837022.

The product of its digits is 864, while the sum is 23.

The square root of 1223316221 is about 34975.9377429684. The cubic root of 1223316221 is about 1069.4970183794.

Adding to 1223316221 its reverse (1226133221), we get a palindrome (2449449442).

The spelling of 1223316221 in words is "one billion, two hundred twenty-three million, three hundred sixteen thousand, two hundred twenty-one".