21023031033 has 56 divisors (see below), whose sum is σ = 32190205320. Its totient is φ = 13719663360.

The previous prime is 21023031031. The next prime is 21023031037. The reversal of 21023031033 is 33013032012.

It can be written as a sum of positive squares in 4 ways, for example, as 1605444624 + 19417586409 = 40068^2 + 139347^2 .

It is not a de Polignac number, because 21023031033 - 2¹ = 21023031031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023030997 and 21023031015.

It is not an unprimeable number, because it can be changed into a prime (21023031031) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 10360263 + ... + 10362291.

It is an arithmetic number, because the mean of its divisors is an integer number (574825095).

Almost surely, 2^21023031033 is an apocalyptic number.

It is an amenable number.

21023031033 is a deficient number, since it is larger than the sum of its proper divisors (11167174287).

21023031033 is an equidigital number, since it uses as much as digits as its factorization.

21023031033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341 (or 2326 counting only the distinct ones).

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

Adding to 21023031033 its reverse (33013032012), we get a palindrome (54036063045).

The spelling of 21023031033 in words is "twenty-one billion, twenty-three million, thirty-one thousand, thirty-three".