21031320033 has 32 divisors (see below), whose sum is σ = 31643870720. Its totient is φ = 13802302800.

The previous prime is 21031320031. The next prime is 21031320047. The reversal of 21031320033 is 33002313012.

It is not a de Polignac number, because 21031320033 - 2¹ = 21031320031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031319988 and 21031320015.

It is not an unprimeable number, because it can be changed into a prime (21031320031) 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 31 ways as a sum of consecutive naturals, for example, 3591558 + ... + 3597408.

It is an arithmetic number, because the mean of its divisors is an integer number (988870960).

Almost surely, 2^21031320033 is an apocalyptic number.

It is an amenable number.

21031320033 is a deficient number, since it is larger than the sum of its proper divisors (10612550687).

21031320033 is a wasteful number, since it uses less digits than its factorization.

21031320033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914 (or 7908 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21031320033 its reverse (33002313012), we get a palindrome (54033633045).

The spelling of 21031320033 in words is "twenty-one billion, thirty-one million, three hundred twenty thousand, thirty-three".