21675634 has 16 divisors (see below), whose sum is σ = 34384896. Its totient is φ = 10231200.

The previous prime is 21675613. The next prime is 21675649. The reversal of 21675634 is 43657612.

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 21675634.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722 + ... + 6805.

It is an arithmetic number, because the mean of its divisors is an integer number (2149056).

Almost surely, 2^21675634 is an apocalyptic number.

21675634 is a deficient number, since it is larger than the sum of its proper divisors (12709262).

21675634 is a wasteful number, since it uses less digits than its factorization.

21675634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601.

The product of its digits is 30240, while the sum is 34.

The square root of 21675634 is about 4655.7098277277. The cubic root of 21675634 is about 278.8200086914.

The spelling of 21675634 in words is "twenty-one million, six hundred seventy-five thousand, six hundred thirty-four".