21650966 has 8 divisors (see below), whose sum is σ = 32798304. Its totient is φ = 10718200.

The previous prime is 21650963. The next prime is 21650971. The reversal of 21650966 is 66905612.

It is a happy number.

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 (21650963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53390 + ... + 53793.

It is an arithmetic number, because the mean of its divisors is an integer number (4099788).

Almost surely, 2^21650966 is an apocalyptic number.

21650966 is a deficient number, since it is larger than the sum of its proper divisors (11147338).

21650966 is a wasteful number, since it uses less digits than its factorization.

21650966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107286.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 21650966 is about 4653.0598534728. The cubic root of 21650966 is about 278.7141979798.

The spelling of 21650966 in words is "twenty-one million, six hundred fifty thousand, nine hundred sixty-six".