22211806 has 4 divisors (see below), whose sum is σ = 33317712. Its totient is φ = 11105902.

The previous prime is 22211801. The next prime is 22211807. The reversal of 22211806 is 60811222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60811222 = 2 ⋅30405611.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5552950 + ... + 5552953.

It is an arithmetic number, because the mean of its divisors is an integer number (8329428).

Almost surely, 2^22211806 is an apocalyptic number.

22211806 is a deficient number, since it is larger than the sum of its proper divisors (11105906).

22211806 is a wasteful number, since it uses less digits than its factorization.

22211806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11105905.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 22211806 is about 4712.9402712107. The cubic root of 22211806 is about 281.1002879918.

The spelling of 22211806 in words is "twenty-two million, two hundred eleven thousand, eight hundred six".