21910268 has 12 divisors (see below), whose sum is σ = 40361160. Its totient is φ = 10378512.

The previous prime is 21910241. The next prime is 21910279. The reversal of 21910268 is 86201912.

It is a self number, because there is not a number n which added to its sum of digits gives 21910268.

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, 144071 + ... + 144222.

It is an arithmetic number, because the mean of its divisors is an integer number (3363430).

Almost surely, 2^21910268 is an apocalyptic number.

It is an amenable number.

21910268 is a deficient number, since it is larger than the sum of its proper divisors (18450892).

21910268 is a wasteful number, since it uses less digits than its factorization.

21910268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288316 (or 288314 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21910268 is about 4680.8405228121. The cubic root of 21910268 is about 279.8224554722.

The spelling of 21910268 in words is "twenty-one million, nine hundred ten thousand, two hundred sixty-eight".