11159821 has 8 divisors (see below), whose sum is σ = 11998080. Its totient is φ = 10346688.

The previous prime is 11159789. The next prime is 11159843. The reversal of 11159821 is 12895111.

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

It is a cyclic number.

It is not a de Polignac number, because 11159821 - 2⁵ = 11159789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11159821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11159881) 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, 5356 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (1499760).

Almost surely, 2^11159821 is an apocalyptic number.

11159821 is the 1786-th nonagonal number.

It is an amenable number.

11159821 is a deficient number, since it is larger than the sum of its proper divisors (838259).

11159821 is a wasteful number, since it uses less digits than its factorization.

11159821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12563.

The product of its digits is 720, while the sum is 28.

The square root of 11159821 is about 3340.6318264664. The cubic root of 11159821 is about 223.4699213977.

The spelling of 11159821 in words is "eleven million, one hundred fifty-nine thousand, eight hundred twenty-one".