21020219 has 8 divisors (see below), whose sum is σ = 23001408. Its totient is φ = 19050760.

The previous prime is 21020161. The next prime is 21020227. The reversal of 21020219 is 91202012.

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 21020219 - 2⁸ = 21019963 is a prime.

It is a super-2 number, since 2×21020219² = 883699213615922, 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 = 21020197 and 21020206.

It is not an unprimeable number, because it can be changed into a prime (21020239) 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 in 7 ways as a sum of consecutive naturals, for example, 1064 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (2875176).

Almost surely, 2^21020219 is an apocalyptic number.

21020219 is a deficient number, since it is larger than the sum of its proper divisors (1981189).

21020219 is a wasteful number, since it uses less digits than its factorization.

21020219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21020219 is about 4584.7812379654. The cubic root of 21020219 is about 275.9809331854.

The spelling of 21020219 in words is "twenty-one million, twenty thousand, two hundred nineteen".