1221131303 has 24 divisors (see below), whose sum is σ = 1438558704. Its totient is φ = 1033468800.

The previous prime is 1221131189. The next prime is 1221131321. The reversal of 1221131303 is 3031311221.

It is not a de Polignac number, because 1221131303 - 2⁸ = 1221131047 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 (1221131603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1803401 + ... + 1804077.

It is an arithmetic number, because the mean of its divisors is an integer number (59939946).

Almost surely, 2^1221131303 is an apocalyptic number.

1221131303 is a deficient number, since it is larger than the sum of its proper divisors (217427401).

1221131303 is a wasteful number, since it uses less digits than its factorization.

1221131303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1221131303 is about 34944.6891959279. The cubic root of 1221131303 is about 1068.8599097754.

Adding to 1221131303 its reverse (3031311221), we get a palindrome (4252442524).

The spelling of 1221131303 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred three".