21112001331321 has 16 divisors (see below), whose sum is σ = 28804183713536. Its totient is φ = 13747248090576.

The previous prime is 21112001331319. The next prime is 21112001331331. The reversal of 21112001331321 is 12313310021112.

It is not a de Polignac number, because 21112001331321 - 2¹ = 21112001331319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112001331331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19493946 + ... + 20548428.

It is an arithmetic number, because the mean of its divisors is an integer number (1800261482096).

Almost surely, 2^{21112001331321} is an apocalyptic number.

It is an amenable number.

21112001331321 is a deficient number, since it is larger than the sum of its proper divisors (7692182382215).

21112001331321 is a wasteful number, since it uses less digits than its factorization.

21112001331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209732.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21112001331321 its reverse (12313310021112), we get a palindrome (33425311352433).

The spelling of 21112001331321 in words is "twenty-one trillion, one hundred twelve billion, one million, three hundred thirty-one thousand, three hundred twenty-one".