21121304333 has 4 divisors (see below), whose sum is σ = 21121601340. Its totient is φ = 21121007328.

The previous prime is 21121304329. The next prime is 21121304353. The reversal of 21121304333 is 33340312112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11235576004 + 9885728329 = 105998^2 + 99427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121304333 - 2² = 21121304329 is a prime.

It is a super-3 number, since 3×21121304333³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121304299 and 21121304308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121304353) 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 3 ways as a sum of consecutive naturals, for example, 28463 + ... + 207491.

It is an arithmetic number, because the mean of its divisors is an integer number (5280400335).

Almost surely, 2^21121304333 is an apocalyptic number.

It is an amenable number.

21121304333 is a deficient number, since it is larger than the sum of its proper divisors (297007).

21121304333 is a wasteful number, since it uses less digits than its factorization.

21121304333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297006.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21121304333 its reverse (33340312112), we get a palindrome (54461616445).

The spelling of 21121304333 in words is "twenty-one billion, one hundred twenty-one million, three hundred four thousand, three hundred thirty-three".