22071209 has 2 divisors, whose sum is σ = 22071210. Its totient is φ = 22071208.

The previous prime is 22071193. The next prime is 22071229. The reversal of 22071209 is 90217022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21187609 + 883600 = 4603^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 22071209 - 2⁴ = 22071193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22071229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11035604 + 11035605.

It is an arithmetic number, because the mean of its divisors is an integer number (11035605).

Almost surely, 2^22071209 is an apocalyptic number.

It is an amenable number.

22071209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22071209 is an equidigital number, since it uses as much as digits as its factorization.

22071209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22071209 is about 4698.0005321413. Note that the first 3 decimals coincide. The cubic root of 22071209 is about 280.5059262879.

The spelling of 22071209 in words is "twenty-two million, seventy-one thousand, two hundred nine".