22001209 has 2 divisors, whose sum is σ = 22001210. Its totient is φ = 22001208.

The previous prime is 22001207. The next prime is 22001237. The reversal of 22001209 is 90210022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21949225 + 51984 = 4685^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001209 - 2¹ = 22001207 is a prime.

Together with 22001207, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22001192 and 22001201.

It is not a weakly prime, because it can be changed into another prime (22001207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000604 + 11000605.

It is an arithmetic number, because the mean of its divisors is an integer number (11000605).

Almost surely, 2^22001209 is an apocalyptic number.

It is an amenable number.

22001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001209 is an equidigital number, since it uses as much as digits as its factorization.

22001209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 22001209 is about 4690.5446378859. The cubic root of 22001209 is about 280.2090657981.

The spelling of 22001209 in words is "twenty-two million, one thousand, two hundred nine".