22201906 has 4 divisors (see below), whose sum is σ = 33302862. Its totient is φ = 11100952.

The previous prime is 22201903. The next prime is 22201909. The reversal of 22201906 is 60910222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60910222 = 2 ⋅30455111.

It is an interprime number because it is at equal distance from previous prime (22201903) and next prime (22201909).

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 27225 = 4709^2 + 165^2 .

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 not an unprimeable number, because it can be changed into a prime (22201903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550475 + ... + 5550478.

Almost surely, 2^22201906 is an apocalyptic number.

22201906 is a deficient number, since it is larger than the sum of its proper divisors (11100956).

22201906 is a wasteful number, since it uses less digits than its factorization.

22201906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100955.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 22201906 is about 4711.8898544002. The cubic root of 22201906 is about 281.0585188172.

The spelling of 22201906 in words is "twenty-two million, two hundred one thousand, nine hundred six".