21112133321 has 8 divisors (see below), whose sum is σ = 21706879488. Its totient is φ = 20521188000.

The previous prime is 21112133311. The next prime is 21112133327. The reversal of 21112133321 is 12333121112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112133321 - 2⁶ = 21112133257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112133293 and 21112133302.

It is not an unprimeable number, because it can be changed into a prime (21112133327) 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 7 ways as a sum of consecutive naturals, for example, 938945 + ... + 961166.

It is an arithmetic number, because the mean of its divisors is an integer number (2713359936).

Almost surely, 2^21112133321 is an apocalyptic number.

It is an amenable number.

21112133321 is a deficient number, since it is larger than the sum of its proper divisors (594746167).

21112133321 is a wasteful number, since it uses less digits than its factorization.

21112133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900423.

The product of its digits is 216, while the sum is 20.

Adding to 21112133321 its reverse (12333121112), we get a palindrome (33445254433).

It can be divided in two parts, 211121 and 33321, that added together give a palindrome (244442).

The spelling of 21112133321 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-three thousand, three hundred twenty-one".