21033109 has 8 divisors (see below), whose sum is σ = 22276800. Its totient is φ = 19816896.

The previous prime is 21033083. The next prime is 21033119. The reversal of 21033109 is 90133012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033119) 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, 5284 + ... + 8365.

It is an arithmetic number, because the mean of its divisors is an integer number (2784600).

Almost surely, 2^21033109 is an apocalyptic number.

It is an amenable number.

21033109 is a deficient number, since it is larger than the sum of its proper divisors (1243691).

21033109 is a wasteful number, since it uses less digits than its factorization.

21033109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13739.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 21033109 is about 4586.1867602617. The cubic root of 21033109 is about 276.0373339191.

The spelling of 21033109 in words is "twenty-one million, thirty-three thousand, one hundred nine".