21331003331 has 8 divisors (see below), whose sum is σ = 24072606000. Its totient is φ = 18723137440.

The previous prime is 21331003303. The next prime is 21331003363. The reversal of 21331003331 is 13330013312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331003331 is a prime.

It is a super-3 number, since 3×21331003331³ (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 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, 33433856 + ... + 33434493.

It is an arithmetic number, because the mean of its divisors is an integer number (3009075750).

Almost surely, 2^21331003331 is an apocalyptic number.

21331003331 is a deficient number, since it is larger than the sum of its proper divisors (2741602669).

21331003331 is a wasteful number, since it uses less digits than its factorization.

21331003331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66868389.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21331003331 its reverse (13330013312), we get a palindrome (34661016643).

The spelling of 21331003331 in words is "twenty-one billion, three hundred thirty-one million, three thousand, three hundred thirty-one".