11156081821 has 8 divisors (see below), whose sum is σ = 11395036800. Its totient is φ = 10917193248.

The previous prime is 11156081803. The next prime is 11156081831. The reversal of 11156081821 is 12818065111.

11156081821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11156081821 - 2⁵ = 11156081789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156081831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480130 + ... + 502828.

It is an arithmetic number, because the mean of its divisors is an integer number (1424379600).

Almost surely, 2^11156081821 is an apocalyptic number.

It is an amenable number.

11156081821 is a deficient number, since it is larger than the sum of its proper divisors (238954979).

11156081821 is a wasteful number, since it uses less digits than its factorization.

11156081821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33203.

The product of its (nonzero) digits is 3840, while the sum is 34.

The spelling of 11156081821 in words is "eleven billion, one hundred fifty-six million, eighty-one thousand, eight hundred twenty-one".