11280921218 has 18 divisors (see below), whose sum is σ = 19685891241. Its totient is φ = 4834229904.

The previous prime is 11280921203. The next prime is 11280921259. The reversal of 11280921218 is 81212908211.

It can be written as a sum of positive squares in 2 ways, for example, as 10546673809 + 734247409 = 102697^2 + 27097^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=75103.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1046078 + ... + 1056806.

Almost surely, 2^11280921218 is an apocalyptic number.

11280921218 is a deficient number, since it is larger than the sum of its proper divisors (8404970023).

11280921218 is an frugal number, since it uses more digits than its factorization.

11280921218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21474 (or 10738 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

Multiplying 11280921218 by its product of nonzero digits (4608), we get a square (51982484972544 = 7209888²).

The spelling of 11280921218 in words is "eleven billion, two hundred eighty million, nine hundred twenty-one thousand, two hundred eighteen".