21194219 has 2 divisors, whose sum is σ = 21194220. Its totient is φ = 21194218.

The previous prime is 21194213. The next prime is 21194221. The reversal of 21194219 is 91249112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21194219 - 2⁴ = 21194203 is a prime.

It is a super-2 number, since 2×21194219² = 898389838039922, which contains 22 as substring.

Together with 21194221, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21194191 and 21194200.

It is not a weakly prime, because it can be changed into another prime (21194213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597109 + 10597110.

It is an arithmetic number, because the mean of its divisors is an integer number (10597110).

Almost surely, 2^21194219 is an apocalyptic number.

21194219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21194219 is an equidigital number, since it uses as much as digits as its factorization.

21194219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 21194219 is about 4603.7179540020. The cubic root of 21194219 is about 276.7403415023.

The spelling of 21194219 in words is "twenty-one million, one hundred ninety-four thousand, two hundred nineteen".