1216120260 has 24 divisors (see below), whose sum is σ = 3405136896. Its totient is φ = 324298720.

The previous prime is 1216120259. The next prime is 1216120261. The reversal of 1216120260 is 620216121.

It is an interprime number because it is at equal distance from previous prime (1216120259) and next prime (1216120261).

It is not an unprimeable number, because it can be changed into a prime (1216120261) 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, 10134276 + ... + 10134395.

It is an arithmetic number, because the mean of its divisors is an integer number (141880704).

Almost surely, 2^1216120260 is an apocalyptic number.

1216120260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216120260 is an abundant number, since it is smaller than the sum of its proper divisors (2189016636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216120260 is a wasteful number, since it uses less digits than its factorization.

1216120260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20268683 (or 20268681 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1216120260 is about 34872.9158517036. The cubic root of 1216120260 is about 1067.3958449497.

Adding to 1216120260 its reverse (620216121), we get a palindrome (1836336381).

The spelling of 1216120260 in words is "one billion, two hundred sixteen million, one hundred twenty thousand, two hundred sixty".