21073219 has 8 divisors (see below), whose sum is σ = 21340800. Its totient is φ = 20807616.

The previous prime is 21073201. The next prime is 21073253. The reversal of 21073219 is 91237012.

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 21073219 - 2⁵ = 21073187 is a prime.

It is a super-2 number, since 2×21073219² = 888161118043922, 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 = 21073193 and 21073202.

It is not an unprimeable number, because it can be changed into a prime (21073259) 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, 34414 + ... + 35020.

It is an arithmetic number, because the mean of its divisors is an integer number (2667600).

Almost surely, 2^21073219 is an apocalyptic number.

21073219 is a deficient number, since it is larger than the sum of its proper divisors (267581).

21073219 is a wasteful number, since it uses less digits than its factorization.

21073219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21073219 is about 4590.5575914043. The cubic root of 21073219 is about 276.2126896234.

The spelling of 21073219 in words is "twenty-one million, seventy-three thousand, two hundred nineteen".