22221211 has 2 divisors, whose sum is σ = 22221212. Its totient is φ = 22221210.

The previous prime is 22221209. The next prime is 22221233. The reversal of 22221211 is 11212222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22221211 - 2¹ = 22221209 is a prime.

It is a super-4 number, since 4×22221211⁴ (a number of 30 digits) contains 4444 as substring.

Together with 22221209, it forms a pair of twin primes.

It is equal to p_1402240 and since 22221211 and 1402240 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221191 and 22221200.

It is not a weakly prime, because it can be changed into another prime (22221911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110605 + 11110606.

It is an arithmetic number, because the mean of its divisors is an integer number (11110606).

Almost surely, 2^22221211 is an apocalyptic number.

22221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221211 is an equidigital number, since it uses as much as digits as its factorization.

22221211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 13.

The square root of 22221211 is about 4713.9379503765. The cubic root of 22221211 is about 281.1399572133.

Adding to 22221211 its reverse (11212222), we get a palindrome (33433433).

The spelling of 22221211 in words is "twenty-two million, two hundred twenty-one thousand, two hundred eleven".