21213311331211 has 16 divisors (see below), whose sum is σ = 22182643314208. Its totient is φ = 20272562323200.

The previous prime is 21213311331181. The next prime is 21213311331217. The reversal of 21213311331211 is 11213311331212.

It is a cyclic number.

It is not a de Polignac number, because 21213311331211 - 2¹⁹ = 21213310806923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213311331217) 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, 35252580 + ... + 35849281.

It is an arithmetic number, because the mean of its divisors is an integer number (1386415207138).

Almost surely, 2^{21213311331211} is an apocalyptic number.

21213311331211 is a deficient number, since it is larger than the sum of its proper divisors (969331982997).

21213311331211 is an equidigital number, since it uses as much as digits as its factorization.

21213311331211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71102062.

The product of its digits is 648, while the sum is 25.

Adding to 21213311331211 its reverse (11213311331212), we get a palindrome (32426622662423).

Subtracting from 21213311331211 its reverse (11213311331212), we obtain a palindrome (9999999999999).

The spelling of 21213311331211 in words is "twenty-one trillion, two hundred thirteen billion, three hundred eleven million, three hundred thirty-one thousand, two hundred eleven".