21331210022321 has 4 divisors (see below), whose sum is σ = 21337258001472. Its totient is φ = 21325162043172.

The previous prime is 21331210022293. The next prime is 21331210022333. The reversal of 21331210022321 is 12322001213312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331210022321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331210022351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023984285 + ... + 3023991338.

It is an arithmetic number, because the mean of its divisors is an integer number (5334314500368).

Almost surely, 2^{21331210022321} is an apocalyptic number.

It is an amenable number.

21331210022321 is a deficient number, since it is larger than the sum of its proper divisors (6047979151).

21331210022321 is an equidigital number, since it uses as much as digits as its factorization.

21331210022321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6047979150.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21331210022321 its reverse (12322001213312), we get a palindrome (33653211235633).

The spelling of 21331210022321 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred ten million, twenty-two thousand, three hundred twenty-one".