21412219 has 2 divisors, whose sum is σ = 21412220. Its totient is φ = 21412218.

The previous prime is 21412217. The next prime is 21412267. The reversal of 21412219 is 91221412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21412219 - 2¹ = 21412217 is a prime.

It is a super-2 number, since 2×21412219² = 916966245007922, which contains 22 as substring.

Together with 21412217, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21412219.

It is not a weakly prime, because it can be changed into another prime (21412217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706109 + 10706110.

It is an arithmetic number, because the mean of its divisors is an integer number (10706110).

Almost surely, 2^21412219 is an apocalyptic number.

21412219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412219 is an equidigital number, since it uses as much as digits as its factorization.

21412219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 21412219 is about 4627.3338976132. Note that the first 3 decimals coincide. The cubic root of 21412219 is about 277.6859409061.

The spelling of 21412219 in words is "twenty-one million, four hundred twelve thousand, two hundred nineteen".