1221203308 has 24 divisors (see below), whose sum is σ = 2401566048. Its totient is φ = 539126016.

The previous prime is 1221203297. The next prime is 1221203309. The reversal of 1221203308 is 8033021221.

It is not an unprimeable number, because it can be changed into a prime (1221203309) 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 7 ways as a sum of consecutive naturals, for example, 509341 + ... + 511732.

It is an arithmetic number, because the mean of its divisors is an integer number (100065252).

Almost surely, 2^1221203308 is an apocalyptic number.

It is an amenable number.

1221203308 is a deficient number, since it is larger than the sum of its proper divisors (1180362740).

1221203308 is a wasteful number, since it uses less digits than its factorization.

1221203308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021113 (or 1021111 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1221203308 is about 34945.7194517440. The cubic root of 1221203308 is about 1068.8809180936.

Adding to 1221203308 its reverse (8033021221), we get a palindrome (9254224529).

The spelling of 1221203308 in words is "one billion, two hundred twenty-one million, two hundred three thousand, three hundred eight".