21332033 has 4 divisors (see below), whose sum is σ = 21351108. Its totient is φ = 21312960.

The previous prime is 21332029. The next prime is 21332053. The reversal of 21332033 is 33023312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9443329 + 11888704 = 3073^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332033 - 2² = 21332029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7748 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (5337777).

Almost surely, 2^21332033 is an apocalyptic number.

It is an amenable number.

21332033 is a deficient number, since it is larger than the sum of its proper divisors (19075).

21332033 is a wasteful number, since it uses less digits than its factorization.

21332033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19074.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 21332033 is about 4618.6613861594. The cubic root of 21332033 is about 277.3388746209.

Adding to 21332033 its reverse (33023312), we get a palindrome (54355345).

The spelling of 21332033 in words is "twenty-one million, three hundred thirty-two thousand, thirty-three".