11520961220 has 36 divisors (see below), whose sum is σ = 25534423404. Its totient is φ = 4365835200.

The previous prime is 11520961213. The next prime is 11520961259. The reversal of 11520961220 is 2216902511.

It can be written as a sum of positive squares in 2 ways, for example, as 3175773316 + 8345187904 = 56354^2 + 91352^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 790631 + ... + 805070.

It is an arithmetic number, because the mean of its divisors is an integer number (709289539).

Almost surely, 2^11520961220 is an apocalyptic number.

11520961220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11520961220 is an abundant number, since it is smaller than the sum of its proper divisors (14013462184).

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

11520961220 is a wasteful number, since it uses less digits than its factorization.

11520961220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595748 (or 1595727 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 11520961220 in words is "eleven billion, five hundred twenty million, nine hundred sixty-one thousand, two hundred twenty".