21093330 has 64 divisors (see below), whose sum is σ = 53756928. Its totient is φ = 5287680.

The previous prime is 21093313. The next prime is 21093377. The reversal of 21093330 is 3339012.

It is a junction number, because it is equal to n+sod(n) for n = 21093297 and 21093306.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 34104 + ... + 34716.

It is an arithmetic number, because the mean of its divisors is an integer number (839952).

Almost surely, 2^21093330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21093330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26878464).

21093330 is an abundant number, since it is smaller than the sum of its proper divisors (32663598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21093330 is a wasteful number, since it uses less digits than its factorization.

21093330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 21093330 is about 4592.7475436823. The cubic root of 21093330 is about 276.3005285568.

The spelling of 21093330 in words is "twenty-one million, ninety-three thousand, three hundred thirty".