21033221033 has 12 divisors (see below), whose sum is σ = 24124344384. Its totient is φ = 18289755000.

The previous prime is 21033221029. The next prime is 21033221063. The reversal of 21033221033 is 33012233012.

It is not a de Polignac number, because 21033221033 - 2² = 21033221029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033220996 and 21033221014.

It is not an unprimeable number, because it can be changed into a prime (21033221003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3776093 + ... + 3781658.

It is an arithmetic number, because the mean of its divisors is an integer number (2010362032).

Almost surely, 2^21033221033 is an apocalyptic number.

21033221033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21033221033 is a deficient number, since it is larger than the sum of its proper divisors (3091123351).

21033221033 is a wasteful number, since it uses less digits than its factorization.

21033221033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7557796 (or 7557785 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21033221033 its reverse (33012233012), we get a palindrome (54045454045).

The spelling of 21033221033 in words is "twenty-one billion, thirty-three million, two hundred twenty-one thousand, thirty-three".