21321110033 has 16 divisors (see below), whose sum is σ = 22537052160. Its totient is φ = 20140520400.

The previous prime is 21321110023. The next prime is 21321110081. The reversal of 21321110033 is 33001112312.

It is a cyclic number.

It is not a de Polignac number, because 21321110033 - 2¹² = 21321105937 is a prime.

It is a super-2 number, since 2×21321110033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321109993 and 21321110020.

It is not an unprimeable number, because it can be changed into a prime (21321110003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532898 + ... + 571508.

It is an arithmetic number, because the mean of its divisors is an integer number (1408565760).

Almost surely, 2^21321110033 is an apocalyptic number.

It is an amenable number.

21321110033 is a deficient number, since it is larger than the sum of its proper divisors (1215942127).

21321110033 is a wasteful number, since it uses less digits than its factorization.

21321110033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39068.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21321110033 its reverse (33001112312), we get a palindrome (54322222345).

The spelling of 21321110033 in words is "twenty-one billion, three hundred twenty-one million, one hundred ten thousand, thirty-three".