21675633 has 16 divisors (see below), whose sum is σ = 33094656. Its totient is φ = 12361680.

The previous prime is 21675613. The next prime is 21675649. The reversal of 21675633 is 33657612.

It is not a de Polignac number, because 21675633 - 2¹³ = 21667441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21675594 and 21675603.

It is not an unprimeable number, because it can be changed into a prime (21675613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19860 + ... + 20922.

It is an arithmetic number, because the mean of its divisors is an integer number (2068416).

Almost surely, 2^21675633 is an apocalyptic number.

It is an amenable number.

21675633 is a deficient number, since it is larger than the sum of its proper divisors (11419023).

21675633 is a wasteful number, since it uses less digits than its factorization.

21675633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044.

The product of its digits is 22680, while the sum is 33.

The square root of 21675633 is about 4655.7097203327. The cubic root of 21675633 is about 278.8200044037.

The spelling of 21675633 in words is "twenty-one million, six hundred seventy-five thousand, six hundred thirty-three".