21966268 has 12 divisors (see below), whose sum is σ = 38873520. Its totient is φ = 10859552.

The previous prime is 21966257. The next prime is 21966281. The reversal of 21966268 is 86266912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21966268.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30496 + ... + 31207.

It is an arithmetic number, because the mean of its divisors is an integer number (3239460).

Almost surely, 2^21966268 is an apocalyptic number.

It is an amenable number.

21966268 is a deficient number, since it is larger than the sum of its proper divisors (16907252).

21966268 is a wasteful number, since it uses less digits than its factorization.

21966268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61796 (or 61794 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 21966268 is about 4686.8185371316. The cubic root of 21966268 is about 280.0606501271.

It can be divided in two parts, 2196 and 6268, that added together give a square (8464 = 92²).

The spelling of 21966268 in words is "twenty-one million, nine hundred sixty-six thousand, two hundred sixty-eight".