11216556 has 60 divisors (see below), whose sum is σ = 31589712. Its totient is φ = 3449952.

The previous prime is 11216521. The next prime is 11216563. The reversal of 11216556 is 65561211.

It is a happy number.

11216556 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 655 + 6 = 666.

11216556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11216556² = 251622257002272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2881 + ... + 5543.

Almost surely, 2^11216556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11216556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15794856).

11216556 is an abundant number, since it is smaller than the sum of its proper divisors (20373156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11216556 is a wasteful number, since it uses less digits than its factorization.

11216556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692 (or 2681 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 11216556 is about 3349.1127183181. The cubic root of 11216556 is about 223.8479782711.

Adding to 11216556 its reverse (65561211), we get a palindrome (76777767).

The spelling of 11216556 in words is "eleven million, two hundred sixteen thousand, five hundred fifty-six".