21933066 has 16 divisors (see below), whose sum is σ = 44024544. Its totient is φ = 7284624.

The previous prime is 21933061. The next prime is 21933091. The reversal of 21933066 is 66033912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21933061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4761 + ... + 8156.

It is an arithmetic number, because the mean of its divisors is an integer number (2751534).

Almost surely, 2^21933066 is an apocalyptic number.

21933066 is an abundant number, since it is smaller than the sum of its proper divisors (22091478).

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

21933066 is a wasteful number, since it uses less digits than its factorization.

21933066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13205.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 21933066 is about 4683.2751360560. The cubic root of 21933066 is about 279.9194751435.

Adding to 21933066 its reverse (66033912), we get a palindrome (87966978).

The spelling of 21933066 in words is "twenty-one million, nine hundred thirty-three thousand, sixty-six".