21102266 has 16 divisors (see below), whose sum is σ = 32123520. Its totient is φ = 10395840.

The previous prime is 21102251. The next prime is 21102269. The reversal of 21102266 is 66220112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21102269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62450 + ... + 62786.

It is an arithmetic number, because the mean of its divisors is an integer number (2007720).

Almost surely, 2^21102266 is an apocalyptic number.

21102266 is a deficient number, since it is larger than the sum of its proper divisors (11021254).

21102266 is a wasteful number, since it uses less digits than its factorization.

21102266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21102266 is about 4593.7202788154. The cubic root of 21102266 is about 276.3395404616.

Adding to 21102266 its reverse (66220112), we get a palindrome (87322378).

The spelling of 21102266 in words is "twenty-one million, one hundred two thousand, two hundred sixty-six".