22172217 has 16 divisors (see below), whose sum is σ = 30227520. Its totient is φ = 14452992.

The previous prime is 22172209. The next prime is 22172251. The reversal of 22172217 is 71227122.

It is not a de Polignac number, because 22172217 - 2³ = 22172209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22172257) 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 in 15 ways as a sum of consecutive naturals, for example, 29634 + ... + 30372.

It is an arithmetic number, because the mean of its divisors is an integer number (1889220).

Almost surely, 2^22172217 is an apocalyptic number.

It is an amenable number.

22172217 is a deficient number, since it is larger than the sum of its proper divisors (8055303).

22172217 is a wasteful number, since it uses less digits than its factorization.

22172217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952.

The product of its digits is 784, while the sum is 24.

The square root of 22172217 is about 4708.7383660594. The cubic root of 22172217 is about 280.9331832033.

Adding to 22172217 its reverse (71227122), we get a palindrome (93399339).

It can be divided in two parts, 2 and 2172217, that multiplied together give a palindrome (4344434).

The spelling of 22172217 in words is "twenty-two million, one hundred seventy-two thousand, two hundred seventeen".