21441266 has 32 divisors (see below), whose sum is σ = 41489280. Its totient is φ = 8064000.

The previous prime is 21441247. The next prime is 21441271. The reversal of 21441266 is 66214412.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 2066 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (1296540).

Almost surely, 2^21441266 is an apocalyptic number.

21441266 is a deficient number, since it is larger than the sum of its proper divisors (20048014).

21441266 is a wasteful number, since it uses less digits than its factorization.

21441266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850.

The product of its digits is 2304, while the sum is 26.

The square root of 21441266 is about 4630.4714662764. The cubic root of 21441266 is about 277.8114502232.

Adding to 21441266 its reverse (66214412), we get a palindrome (87655678).

The spelling of 21441266 in words is "twenty-one million, four hundred forty-one thousand, two hundred sixty-six".