1221031223 has 4 divisors (see below), whose sum is σ = 1221319680. Its totient is φ = 1220742768.

The previous prime is 1221031211. The next prime is 1221031241. The reversal of 1221031223 is 3221301221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221031223 - 2¹⁰ = 1221030199 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 (1221031243) 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, 137783 + ... + 146376.

It is an arithmetic number, because the mean of its divisors is an integer number (305329920).

Almost surely, 2^1221031223 is an apocalyptic number.

1221031223 is a deficient number, since it is larger than the sum of its proper divisors (288457).

1221031223 is an equidigital number, since it uses as much as digits as its factorization.

1221031223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288456.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221031223 is about 34943.2571893348. The cubic root of 1221031223 is about 1068.8307088691.

Adding to 1221031223 its reverse (3221301221), we get a palindrome (4442332444).

The spelling of 1221031223 in words is "one billion, two hundred twenty-one million, thirty-one thousand, two hundred twenty-three".