21116219 has 2 divisors, whose sum is σ = 21116220. Its totient is φ = 21116218.

The previous prime is 21116213. The next prime is 21116257. The reversal of 21116219 is 91261112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21116219 - 2⁴ = 21116203 is a prime.

It is a super-2 number, since 2×21116219² = 891789409711922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21116194 and 21116203.

It is not a weakly prime, because it can be changed into another prime (21116213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558109 + 10558110.

It is an arithmetic number, because the mean of its divisors is an integer number (10558110).

Almost surely, 2^21116219 is an apocalyptic number.

21116219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116219 is an equidigital number, since it uses as much as digits as its factorization.

21116219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 21116219 is about 4595.2387315568. The cubic root of 21116219 is about 276.4004330707.

The spelling of 21116219 in words is "twenty-one million, one hundred sixteen thousand, two hundred nineteen".