21330222 has 8 divisors (see below), whose sum is σ = 42660456. Its totient is φ = 7110072.

The previous prime is 21330163. The next prime is 21330251. The reversal of 21330222 is 22203312.

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

21330222 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1777513 + ... + 1777524.

It is an arithmetic number, because the mean of its divisors is an integer number (5332557).

Almost surely, 2^21330222 is an apocalyptic number.

21330222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21330222 is a wasteful number, since it uses less digits than its factorization.

21330222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555042.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21330222 is about 4618.4653295224. The cubic root of 21330222 is about 277.3310260970.

Adding to 21330222 its reverse (22203312), we get a palindrome (43533534).

The spelling of 21330222 in words is "twenty-one million, three hundred thirty thousand, two hundred twenty-two".