20219219 has 2 divisors, whose sum is σ = 20219220. Its totient is φ = 20219218.

The previous prime is 20219207. The next prime is 20219237. The reversal of 20219219 is 91291202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20219219 is a prime.

It is a super-2 number, since 2×20219219² = 817633633939922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20209219) 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, 10109609 + 10109610.

It is an arithmetic number, because the mean of its divisors is an integer number (10109610).

Almost surely, 2^20219219 is an apocalyptic number.

20219219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219219 is an equidigital number, since it uses as much as digits as its factorization.

20219219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20219219 is about 4496.5785882157. The cubic root of 20219219 is about 272.4299132381.

The spelling of 20219219 in words is "twenty million, two hundred nineteen thousand, two hundred nineteen".