1220120403515 has 24 divisors (see below), whose sum is σ = 1614293004240. Its totient is φ = 880058136384.

The previous prime is 1220120403493. The next prime is 1220120403521. The reversal of 1220120403515 is 5153040210221.

It is a de Polignac number, because none of the positive numbers 2^k-1220120403515 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4955825 + ... + 5196194.

It is an arithmetic number, because the mean of its divisors is an integer number (67262208510).

Almost surely, 2^{1220120403515} is an apocalyptic number.

1220120403515 is a deficient number, since it is larger than the sum of its proper divisors (394172600725).

1220120403515 is a wasteful number, since it uses less digits than its factorization.

1220120403515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10152123 (or 10152080 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 1220120403515 its reverse (5153040210221), we get a palindrome (6373160613736).

The spelling of 1220120403515 in words is "one trillion, two hundred twenty billion, one hundred twenty million, four hundred three thousand, five hundred fifteen".