21033117 has 24 divisors (see below), whose sum is σ = 34841664. Its totient is φ = 11977344.

The previous prime is 21033083. The next prime is 21033119. The reversal of 21033117 is 71133012.

It is not a de Polignac number, because 21033117 - 2⁶ = 21033053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35173 + ... + 35765.

It is an arithmetic number, because the mean of its divisors is an integer number (1451736).

Almost surely, 2^21033117 is an apocalyptic number.

It is an amenable number.

21033117 is a deficient number, since it is larger than the sum of its proper divisors (13808547).

21033117 is a wasteful number, since it uses less digits than its factorization.

21033117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21033117 is about 4586.1876324459. The cubic root of 21033117 is about 276.0373689163.

Adding to 21033117 its reverse (71133012), we get a palindrome (92166129).

The spelling of 21033117 in words is "twenty-one million, thirty-three thousand, one hundred seventeen".