1221013115 has 32 divisors (see below), whose sum is σ = 1716720000. Its totient is φ = 833341824.

The previous prime is 1221013109. The next prime is 1221013127. The reversal of 1221013115 is 5113101221.

It is not a de Polignac number, because 1221013115 - 2⁶ = 1221013051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221013093 and 1221013102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391181 + ... + 394289.

It is an arithmetic number, because the mean of its divisors is an integer number (53647500).

Almost surely, 2^1221013115 is an apocalyptic number.

1221013115 is a deficient number, since it is larger than the sum of its proper divisors (495706885).

1221013115 is an equidigital number, since it uses as much as digits as its factorization.

1221013115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364 (or 3350 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1221013115 is about 34942.9980825916. The cubic root of 1221013115 is about 1068.8254252253.

Adding to 1221013115 its reverse (5113101221), we get a palindrome (6334114336).

The spelling of 1221013115 in words is "one billion, two hundred twenty-one million, thirteen thousand, one hundred fifteen".