21049633 has 8 divisors (see below), whose sum is σ = 23584320. Its totient is φ = 18618480.

The previous prime is 21049627. The next prime is 21049643. The reversal of 21049633 is 33694012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21049633 - 2⁹ = 21049121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21049643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25453 + ... + 26266.

It is an arithmetic number, because the mean of its divisors is an integer number (2948040).

Almost surely, 2^21049633 is an apocalyptic number.

It is an amenable number.

21049633 is a deficient number, since it is larger than the sum of its proper divisors (2534687).

21049633 is a wasteful number, since it uses less digits than its factorization.

21049633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51767.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 21049633 is about 4587.9879032099. The cubic root of 21049633 is about 276.1096016782.

The spelling of 21049633 in words is "twenty-one million, forty-nine thousand, six hundred thirty-three".