22122217 has 4 divisors (see below), whose sum is σ = 23823940. Its totient is φ = 20420496.

The previous prime is 22122203. The next prime is 22122223. The reversal of 22122217 is 71222122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2621161 + 19501056 = 1619^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 22122217 - 2¹¹ = 22120169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122194 and 22122203.

It is not an unprimeable number, because it can be changed into a prime (22122017) 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 3 ways as a sum of consecutive naturals, for example, 850842 + ... + 850867.

It is an arithmetic number, because the mean of its divisors is an integer number (5955985).

Almost surely, 2^22122217 is an apocalyptic number.

It is an amenable number.

22122217 is a deficient number, since it is larger than the sum of its proper divisors (1701723).

22122217 is a wasteful number, since it uses less digits than its factorization.

22122217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701722.

The product of its digits is 224, while the sum is 19.

The square root of 22122217 is about 4703.4260916910. The cubic root of 22122217 is about 280.7218491846.

Adding to 22122217 its reverse (71222122), we get a palindrome (93344339).

The spelling of 22122217 in words is "twenty-two million, one hundred twenty-two thousand, two hundred seventeen".