1221143303 has 16 divisors (see below), whose sum is σ = 1327034016. Its totient is φ = 1119144960.

The previous prime is 1221143293. The next prime is 1221143321. The reversal of 1221143303 is 3033411221.

It is a cyclic number.

It is not a de Polignac number, because 1221143303 - 2⁶ = 1221143239 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 (1221143503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453800 + ... + 456482.

It is an arithmetic number, because the mean of its divisors is an integer number (82939626).

Almost surely, 2^1221143303 is an apocalyptic number.

1221143303 is a deficient number, since it is larger than the sum of its proper divisors (105890713).

1221143303 is a wasteful number, since it uses less digits than its factorization.

1221143303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1221143303 is about 34944.8608954164. The cubic root of 1221143303 is about 1068.8634109760.

Adding to 1221143303 its reverse (3033411221), we get a palindrome (4254554524).

The spelling of 1221143303 in words is "one billion, two hundred twenty-one million, one hundred forty-three thousand, three hundred three".