21120219 has 12 divisors (see below), whose sum is σ = 30710992. Its totient is φ = 13986000.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120219 is 91202112.

It is not a de Polignac number, because 21120219 - 2¹¹ = 21118171 is a prime.

It is a super-2 number, since 2×21120219² = 892127301215922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120259) 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 in 11 ways as a sum of consecutive naturals, for example, 6412 + ... + 9129.

Almost surely, 2^21120219 is an apocalyptic number.

21120219 is a deficient number, since it is larger than the sum of its proper divisors (9590773).

21120219 is a wasteful number, since it uses less digits than its factorization.

21120219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15698 (or 15695 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 21120219 is about 4595.6739440478. The cubic root of 21120219 is about 276.4178846155.

The spelling of 21120219 in words is "twenty-one million, one hundred twenty thousand, two hundred nineteen".