21080219 has 2 divisors, whose sum is σ = 21080220. Its totient is φ = 21080218.

The previous prime is 21080203. The next prime is 21080231. The reversal of 21080219 is 91208012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21080219 - 2⁴ = 21080203 is a prime.

It is a super-2 number, since 2×21080219² = 888751266175922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1334723 and since 21080219 and 1334723 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 = 21080194 and 21080203.

It is not a weakly prime, because it can be changed into another prime (21080249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10540109 + 10540110.

It is an arithmetic number, because the mean of its divisors is an integer number (10540110).

Almost surely, 2^21080219 is an apocalyptic number.

21080219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21080219 is an equidigital number, since it uses as much as digits as its factorization.

21080219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 21080219 is about 4591.3199627122. The cubic root of 21080219 is about 276.2432699029.

The spelling of 21080219 in words is "twenty-one million, eighty thousand, two hundred nineteen".