21101219 has 2 divisors, whose sum is σ = 21101220. Its totient is φ = 21101218.

The previous prime is 21101209. The next prime is 21101243. The reversal of 21101219 is 91210112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101219 - 2²⁴ = 4324003 is a prime.

It is a super-2 number, since 2×21101219² = 890522886571922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101197 and 21101206.

It is not a weakly prime, because it can be changed into another prime (21101209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550609 + 10550610.

It is an arithmetic number, because the mean of its divisors is an integer number (10550610).

Almost surely, 2^21101219 is an apocalyptic number.

21101219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101219 is an equidigital number, since it uses as much as digits as its factorization.

21101219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21101219 is about 4593.6063174809. The cubic root of 21101219 is about 276.3349701423.

The spelling of 21101219 in words is "twenty-one million, one hundred one thousand, two hundred nineteen".