22021211 has 2 divisors, whose sum is σ = 22021212. Its totient is φ = 22021210.

The previous prime is 22021177. The next prime is 22021229. The reversal of 22021211 is 11212022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021211 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22021192 and 22021201.

It is not a weakly prime, because it can be changed into another prime (22021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010605 + 11010606.

It is an arithmetic number, because the mean of its divisors is an integer number (11010606).

Almost surely, 2^22021211 is an apocalyptic number.

22021211 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021211 is an equidigital number, since it uses as much as digits as its factorization.

22021211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22021211 is about 4692.6763152811. The cubic root of 22021211 is about 280.2939557407.

Adding to 22021211 its reverse (11212022), we get a palindrome (33233233).

The spelling of 22021211 in words is "twenty-two million, twenty-one thousand, two hundred eleven".