21202320033 has 12 divisors (see below), whose sum is σ = 30633044260. Its totient is φ = 14131431936.

The previous prime is 21202320011. The next prime is 21202320067. The reversal of 21202320033 is 33002320212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16060999824 + 5141320209 = 126732^2 + 71703^2 .

It is not a de Polignac number, because 21202320033 - 2¹³ = 21202311841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202319988 and 21202320015.

It is not an unprimeable number, because it can be changed into a prime (21202320233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248116 + ... + 322437.

Almost surely, 2^21202320033 is an apocalyptic number.

It is an amenable number.

21202320033 is a deficient number, since it is larger than the sum of its proper divisors (9430724227).

21202320033 is a wasteful number, since it uses less digits than its factorization.

21202320033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574688 (or 574685 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21202320033 its reverse (33002320212), we get a palindrome (54204640245).

The spelling of 21202320033 in words is "twenty-one billion, two hundred two million, three hundred twenty thousand, thirty-three".