21022219 has 2 divisors, whose sum is σ = 21022220. Its totient is φ = 21022218.

The previous prime is 21022213. The next prime is 21022223. The reversal of 21022219 is 91222012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21022219 - 2⁷ = 21022091 is a prime.

It is a super-2 number, since 2×21022219² = 883867383367922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022196 and 21022205.

It is not a weakly prime, because it can be changed into another prime (21022213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511109 + 10511110.

It is an arithmetic number, because the mean of its divisors is an integer number (10511110).

Almost surely, 2^21022219 is an apocalyptic number.

21022219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022219 is an equidigital number, since it uses as much as digits as its factorization.

21022219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21022219 is about 4584.9993456924. Note that the first 3 decimals coincide. The cubic root of 21022219 is about 275.9896857799.

The spelling of 21022219 in words is "twenty-one million, twenty-two thousand, two hundred nineteen".