1221120313 has 16 divisors (see below), whose sum is σ = 1447649280. Its totient is φ = 1007810496.

The previous prime is 1221120289. The next prime is 1221120323. The reversal of 1221120313 is 3130211221.

It is not a de Polignac number, because 1221120313 - 2⁵ = 1221120281 is a prime.

It is a super-2 number, since 2×1221120313² = 2982269637642435938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221120323) 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, 67656 + ... + 83782.

It is an arithmetic number, because the mean of its divisors is an integer number (90478080).

Almost surely, 2^1221120313 is an apocalyptic number.

It is an amenable number.

1221120313 is a deficient number, since it is larger than the sum of its proper divisors (226528967).

1221120313 is a wasteful number, since it uses less digits than its factorization.

1221120313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16536.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221120313 is about 34944.5319470729. The cubic root of 1221120313 is about 1068.8567032391.

Adding to 1221120313 its reverse (3130211221), we get a palindrome (4351331534).

The spelling of 1221120313 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, three hundred thirteen".