22219209 has 6 divisors (see below), whose sum is σ = 32094426. Its totient is φ = 14812800.

The previous prime is 22219201. The next prime is 22219217. The reversal of 22219209 is 90291222.

It is an interprime number because it is at equal distance from previous prime (22219201) and next prime (22219217).

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 10419984 = 3435^2 + 3228^2 .

It is not a de Polignac number, because 22219209 - 2³ = 22219201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22219201) 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 5 ways as a sum of consecutive naturals, for example, 1234392 + ... + 1234409.

It is an arithmetic number, because the mean of its divisors is an integer number (5349071).

Almost surely, 2^22219209 is an apocalyptic number.

It is an amenable number.

22219209 is a deficient number, since it is larger than the sum of its proper divisors (9875217).

22219209 is a wasteful number, since it uses less digits than its factorization.

22219209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468807 (or 2468804 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 22219209 is about 4713.7255965955. The cubic root of 22219209 is about 281.1315139426.

The spelling of 22219209 in words is "twenty-two million, two hundred nineteen thousand, two hundred nine".