22111866 has 160 divisors (see below), whose sum is σ = 63562752. Its totient is φ = 5598720.

The previous prime is 22111853. The next prime is 22111867. The reversal of 22111866 is 66811122.

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

It is not an unprimeable number, because it can be changed into a prime (22111867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 597600 + ... + 597636.

Almost surely, 2^22111866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22111866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31781376).

22111866 is an abundant number, since it is smaller than the sum of its proper divisors (41450886).

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

22111866 is a wasteful number, since it uses less digits than its factorization.

22111866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 97 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 22111866 is about 4702.3255948520. The cubic root of 22111866 is about 280.6780590410.

Adding to 22111866 its reverse (66811122), we get a palindrome (88922988).

The spelling of 22111866 in words is "twenty-two million, one hundred eleven thousand, eight hundred sixty-six".