21322311211221 has 4 divisors (see below), whose sum is σ = 28429748281632. Its totient is φ = 14214874140812.

The previous prime is 21322311211219. The next prime is 21322311211261. The reversal of 21322311211221 is 12211211322312.

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 21322311211221 - 2¹ = 21322311211219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21322311211191 and 21322311211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322311211261) 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, 3553718535201 + ... + 3553718535206.

It is an arithmetic number, because the mean of its divisors is an integer number (7107437070408).

Almost surely, 2^{21322311211221} is an apocalyptic number.

It is an amenable number.

21322311211221 is a deficient number, since it is larger than the sum of its proper divisors (7107437070411).

21322311211221 is an equidigital number, since it uses as much as digits as its factorization.

21322311211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107437070410.

The product of its digits is 576, while the sum is 24.

Adding to 21322311211221 its reverse (12211211322312), we get a palindrome (33533522533533).

The spelling of 21322311211221 in words is "twenty-one trillion, three hundred twenty-two billion, three hundred eleven million, two hundred eleven thousand, two hundred twenty-one".