11180921 has 8 divisors (see below), whose sum is σ = 12070080. Its totient is φ = 10325392.

The previous prime is 11180881. The next prime is 11180927. The reversal of 11180921 is 12908111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11180921 - 2⁶ = 11180857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11180927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7715 + ... + 9048.

It is an arithmetic number, because the mean of its divisors is an integer number (1508760).

Almost surely, 2^11180921 is an apocalyptic number.

It is an amenable number.

11180921 is a deficient number, since it is larger than the sum of its proper divisors (889159).

11180921 is a wasteful number, since it uses less digits than its factorization.

11180921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16815.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 11180921 is about 3343.7884203400. The cubic root of 11180921 is about 223.6106717662.

The spelling of 11180921 in words is "eleven million, one hundred eighty thousand, nine hundred twenty-one".