22042217 has 4 divisors (see below), whose sum is σ = 23338836. Its totient is φ = 20745600.

The previous prime is 22042213. The next prime is 22042219. The reversal of 22042217 is 71224022.

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: 71224022 = 2 ⋅35612011.

It can be written as a sum of positive squares in 2 ways, for example, as 18696976 + 3345241 = 4324^2 + 1829^2 .

It is a cyclic number.

It is not a de Polignac number, because 22042217 - 2² = 22042213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22042213) 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 3 ways as a sum of consecutive naturals, for example, 648284 + ... + 648317.

It is an arithmetic number, because the mean of its divisors is an integer number (5834709).

Almost surely, 2^22042217 is an apocalyptic number.

It is an amenable number.

22042217 is a deficient number, since it is larger than the sum of its proper divisors (1296619).

22042217 is a wasteful number, since it uses less digits than its factorization.

22042217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296618.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 22042217 is about 4694.9139502232. The cubic root of 22042217 is about 280.3830514114.

Adding to 22042217 its reverse (71224022), we get a palindrome (93266239).

The spelling of 22042217 in words is "twenty-two million, forty-two thousand, two hundred seventeen".