11156221 has 8 divisors (see below), whose sum is σ = 11461824. Its totient is φ = 10852800.

The previous prime is 11156207. The next prime is 11156227. The reversal of 11156221 is 12265111.

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 11156221 - 2¹³ = 11148029 is a prime.

It is a super-2 number, since 2×11156221² = 248922534001682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156227) 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, 16920 + ... + 17566.

It is an arithmetic number, because the mean of its divisors is an integer number (1432728).

Almost surely, 2^11156221 is an apocalyptic number.

It is an amenable number.

11156221 is a deficient number, since it is larger than the sum of its proper divisors (305603).

11156221 is an equidigital number, since it uses as much as digits as its factorization.

11156221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091.

The product of its digits is 120, while the sum is 19.

The square root of 11156221 is about 3340.0929627781. The cubic root of 11156221 is about 223.4458894041.

The spelling of 11156221 in words is "eleven million, one hundred fifty-six thousand, two hundred twenty-one".