21133219 has 2 divisors, whose sum is σ = 21133220. Its totient is φ = 21133218.

The previous prime is 21133213. The next prime is 21133237. The reversal of 21133219 is 91233112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133219 - 2²¹ = 19036067 is a prime.

It is a super-2 number, since 2×21133219² = 893225890603922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21133219.

It is not a weakly prime, because it can be changed into another prime (21133213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566609 + 10566610.

It is an arithmetic number, because the mean of its divisors is an integer number (10566610).

Almost surely, 2^21133219 is an apocalyptic number.

21133219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133219 is an equidigital number, since it uses as much as digits as its factorization.

21133219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 21133219 is about 4597.0881000912. The cubic root of 21133219 is about 276.4745869232.

The spelling of 21133219 in words is "twenty-one million, one hundred thirty-three thousand, two hundred nineteen".