11533531220 has 48 divisors (see below), whose sum is σ = 25296727680. Its totient is φ = 4412628864.

The previous prime is 11533531201. The next prime is 11533531231. The reversal of 11533531220 is 2213533511.

It is a self number, because there is not a number n which added to its sum of digits gives 11533531220.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 88424 + ... + 175743.

It is an arithmetic number, because the mean of its divisors is an integer number (527015160).

Almost surely, 2^11533531220 is an apocalyptic number.

11533531220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11533531220 is an abundant number, since it is smaller than the sum of its proper divisors (13763196460).

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

11533531220 is a wasteful number, since it uses less digits than its factorization.

11533531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264272 (or 264270 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 11533531220 in words is "eleven billion, five hundred thirty-three million, five hundred thirty-one thousand, two hundred twenty".