1221231223 has 4 divisors (see below), whose sum is σ = 1221431400. Its totient is φ = 1221031048.

The previous prime is 1221231203. The next prime is 1221231233. The reversal of 1221231223 is 3221321221.

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 1221231223 - 2²¹ = 1219134071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221231203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90640 + ... + 103237.

It is an arithmetic number, because the mean of its divisors is an integer number (305357850).

Almost surely, 2^1221231223 is an apocalyptic number.

1221231223 is a deficient number, since it is larger than the sum of its proper divisors (200177).

1221231223 is an equidigital number, since it uses as much as digits as its factorization.

1221231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200176.

The product of its digits is 288, while the sum is 19.

The square root of 1221231223 is about 34946.1188546024. The cubic root of 1221231223 is about 1068.8890624060.

Adding to 1221231223 its reverse (3221321221), we get a palindrome (4442552444).

The spelling of 1221231223 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-three".