21241166 has 8 divisors (see below), whose sum is σ = 32960520. Its totient is φ = 10254328.

The previous prime is 21241163. The next prime is 21241217. The reversal of 21241166 is 66114212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241163) 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, 183056 + ... + 183171.

It is an arithmetic number, because the mean of its divisors is an integer number (4120065).

Almost surely, 2^21241166 is an apocalyptic number.

21241166 is a deficient number, since it is larger than the sum of its proper divisors (11719354).

21241166 is a wasteful number, since it uses less digits than its factorization.

21241166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366258.

The product of its digits is 576, while the sum is 23.

The square root of 21241166 is about 4608.8139472103. The cubic root of 21241166 is about 276.9445252895.

Adding to 21241166 its reverse (66114212), we get a palindrome (87355378).

The spelling of 21241166 in words is "twenty-one million, two hundred forty-one thousand, one hundred sixty-six".