21011330330321 has 4 divisors (see below), whose sum is σ = 21011364750144. Its totient is φ = 21011295910500.

The previous prime is 21011330330279. The next prime is 21011330330323. The reversal of 21011330330321 is 12303303311012.

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 not a de Polignac number, because 21011330330321 - 2⁶ = 21011330330257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011330330323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16277405 + ... + 17520746.

It is an arithmetic number, because the mean of its divisors is an integer number (5252841187536).

Almost surely, 2^{21011330330321} is an apocalyptic number.

It is an amenable number.

21011330330321 is a deficient number, since it is larger than the sum of its proper divisors (34419823).

21011330330321 is an equidigital number, since it uses as much as digits as its factorization.

21011330330321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34419822.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21011330330321 its reverse (12303303311012), we get a palindrome (33314633641333).

The spelling of 21011330330321 in words is "twenty-one trillion, eleven billion, three hundred thirty million, three hundred thirty thousand, three hundred twenty-one".