21131023321 has 8 divisors (see below), whose sum is σ = 21624793344. Its totient is φ = 20637360240.

The previous prime is 21131023279. The next prime is 21131023349. The reversal of 21131023321 is 12332013112.

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 21131023321 - 2¹⁵ = 21130990553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131021321) 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 7 ways as a sum of consecutive naturals, for example, 486891 + ... + 528511.

It is an arithmetic number, because the mean of its divisors is an integer number (2703099168).

Almost surely, 2^21131023321 is an apocalyptic number.

It is an amenable number.

21131023321 is a deficient number, since it is larger than the sum of its proper divisors (493770023).

21131023321 is a wasteful number, since it uses less digits than its factorization.

21131023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53471.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21131023321 its reverse (12332013112), we get a palindrome (33463036433).

The spelling of 21131023321 in words is "twenty-one billion, one hundred thirty-one million, twenty-three thousand, three hundred twenty-one".