21835664 has 20 divisors (see below), whose sum is σ = 43025520. Its totient is φ = 10732320.

The previous prime is 21835663. The next prime is 21835699. The reversal of 21835664 is 46653812.

It is not an unprimeable number, because it can be changed into a prime (21835663) 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, 10622 + ... + 12509.

It is an arithmetic number, because the mean of its divisors is an integer number (2151276).

Almost surely, 2^21835664 is an apocalyptic number.

It is an amenable number.

21835664 is a deficient number, since it is larger than the sum of its proper divisors (21189856).

21835664 is a wasteful number, since it uses less digits than its factorization.

21835664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23198 (or 23192 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21835664 is about 4672.8646460175. The cubic root of 21835664 is about 279.5044978011.

The spelling of 21835664 in words is "twenty-one million, eight hundred thirty-five thousand, six hundred sixty-four".