1221203323 has 4 divisors (see below), whose sum is σ = 1224024088. Its totient is φ = 1218382560.

The previous prime is 1221203309. The next prime is 1221203351. The reversal of 1221203323 is 3233021221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221203323 is a prime.

It is a super-2 number, since 2×1221203323² = 2982675112212484658, which contains 22 as substring.

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 1221203323.

It is not an unprimeable number, because it can be changed into a prime (1221203383) 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, 1409733 + ... + 1410598.

It is an arithmetic number, because the mean of its divisors is an integer number (306006022).

Almost surely, 2^1221203323 is an apocalyptic number.

1221203323 is a deficient number, since it is larger than the sum of its proper divisors (2820765).

1221203323 is an equidigital number, since it uses as much as digits as its factorization.

1221203323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820764.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221203323 is about 34945.7196663626. The cubic root of 1221203323 is about 1068.8809224700.

Adding to 1221203323 its reverse (3233021221), we get a palindrome (4454224544).

The spelling of 1221203323 in words is "one billion, two hundred twenty-one million, two hundred three thousand, three hundred twenty-three".