21331003321 has 8 divisors (see below), whose sum is σ = 22271814720. Its totient is φ = 20391306672.

The previous prime is 21331003303. The next prime is 21331003363. The reversal of 21331003321 is 12330013312.

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 21331003321 - 2⁵ = 21331003289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331003301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239455 + ... + 316228.

It is an arithmetic number, because the mean of its divisors is an integer number (2783976840).

Almost surely, 2^21331003321 is an apocalyptic number.

It is an amenable number.

21331003321 is a deficient number, since it is larger than the sum of its proper divisors (940811399).

21331003321 is a wasteful number, since it uses less digits than its factorization.

21331003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557375.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21331003321 its reverse (12330013312), we get a palindrome (33661016633).

Subtracting from 21331003321 its reverse (12330013312), we obtain a palindrome (9000990009).

The spelling of 21331003321 in words is "twenty-one billion, three hundred thirty-one million, three thousand, three hundred twenty-one".