21033219 has 4 divisors (see below), whose sum is σ = 28044296. Its totient is φ = 14022144.

The previous prime is 21033203. The next prime is 21033223. The reversal of 21033219 is 91233012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21033219 - 2⁴ = 21033203 is a prime.

It is a super-2 number, since 2×21033219² = 884792603003922, 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 = 21033195 and 21033204.

It is not an unprimeable number, because it can be changed into a prime (21033239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505534 + ... + 3505539.

It is an arithmetic number, because the mean of its divisors is an integer number (7011074).

Almost surely, 2^21033219 is an apocalyptic number.

21033219 is a deficient number, since it is larger than the sum of its proper divisors (7011077).

21033219 is an equidigital number, since it uses as much as digits as its factorization.

21033219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011076.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21033219 is about 4586.1987527799. The cubic root of 21033219 is about 276.0378151295.

The spelling of 21033219 in words is "twenty-one million, thirty-three thousand, two hundred nineteen".