21675064 has 16 divisors (see below), whose sum is σ = 42042600. Its totient is φ = 10463712.

The previous prime is 21675061. The next prime is 21675077. The reversal of 21675064 is 46057612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675061) 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, 46482 + ... + 46945.

Almost surely, 2^21675064 is an apocalyptic number.

It is an amenable number.

21675064 is a deficient number, since it is larger than the sum of its proper divisors (20367536).

21675064 is a wasteful number, since it uses less digits than its factorization.

21675064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93462 (or 93458 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 21675064 is about 4655.6486121700. The cubic root of 21675064 is about 278.8175646445.

The spelling of 21675064 in words is "twenty-one million, six hundred seventy-five thousand, sixty-four".