21107219 has 8 divisors (see below), whose sum is σ = 24250368. Its totient is φ = 17996040.

The previous prime is 21107209. The next prime is 21107221. The reversal of 21107219 is 91270112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21107219 - 2¹² = 21103123 is a prime.

It is a super-2 number, since 2×21107219² = 891029387827922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21107194 and 21107203.

It is not an unprimeable number, because it can be changed into a prime (21107209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6557 + ... + 9230.

It is an arithmetic number, because the mean of its divisors is an integer number (3031296).

Almost surely, 2^21107219 is an apocalyptic number.

21107219 is a deficient number, since it is larger than the sum of its proper divisors (3143149).

21107219 is a wasteful number, since it uses less digits than its factorization.

21107219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15985.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 21107219 is about 4594.2593527140. The cubic root of 21107219 is about 276.3611590353.

The spelling of 21107219 in words is "twenty-one million, one hundred seven thousand, two hundred nineteen".