21304321121 has 8 divisors (see below), whose sum is σ = 22461153600. Its totient is φ = 20151043920.

The previous prime is 21304321117. The next prime is 21304321123. The reversal of 21304321121 is 12112340312.

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 21304321121 - 2² = 21304321117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304321093 and 21304321102.

It is not an unprimeable number, because it can be changed into a prime (21304321123) 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, 876506 + ... + 900483.

It is an arithmetic number, because the mean of its divisors is an integer number (2807644200).

Almost surely, 2^21304321121 is an apocalyptic number.

It is an amenable number.

21304321121 is a deficient number, since it is larger than the sum of its proper divisors (1156832479).

21304321121 is a wasteful number, since it uses less digits than its factorization.

21304321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777639.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21304321121 its reverse (12112340312), we get a palindrome (33416661433).

The spelling of 21304321121 in words is "twenty-one billion, three hundred four million, three hundred twenty-one thousand, one hundred twenty-one".