21803066 has 8 divisors (see below), whose sum is σ = 32731104. Its totient is φ = 10892700.

The previous prime is 21803063. The next prime is 21803081. The reversal of 21803066 is 66030812.

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

It is not an unprimeable number, because it can be changed into a prime (21803063) 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 3 ways as a sum of consecutive naturals, for example, 710 + ... + 6641.

It is an arithmetic number, because the mean of its divisors is an integer number (4091388).

Almost surely, 2^21803066 is an apocalyptic number.

21803066 is a deficient number, since it is larger than the sum of its proper divisors (10928038).

21803066 is a wasteful number, since it uses less digits than its factorization.

21803066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8836.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21803066 is about 4669.3753329541. The cubic root of 21803066 is about 279.3653397491.

Adding to 21803066 its reverse (66030812), we get a palindrome (87833878).

The spelling of 21803066 in words is "twenty-one million, eight hundred three thousand, sixty-six".