21033885 has 16 divisors (see below), whose sum is σ = 33724800. Its totient is φ = 11194560.

The previous prime is 21033877. The next prime is 21033907. The reversal of 21033885 is 58833012.

It is a happy number.

It is not a de Polignac number, because 21033885 - 2³ = 21033877 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7815 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (2107800).

Almost surely, 2^21033885 is an apocalyptic number.

It is an amenable number.

21033885 is a deficient number, since it is larger than the sum of its proper divisors (12690915).

21033885 is a wasteful number, since it uses less digits than its factorization.

21033885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21033885 is about 4586.2713613566. The cubic root of 21033885 is about 276.0407286041.

Adding to 21033885 its reverse (58833012), we get a palindrome (79866897).

The spelling of 21033885 in words is "twenty-one million, thirty-three thousand, eight hundred eighty-five".