13211322221 has 4 divisors (see below), whose sum is σ = 13213482492. Its totient is φ = 13209161952.

The previous prime is 13211322209. The next prime is 13211322227. The reversal of 13211322221 is 12222311231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12222311231 = 13 ⋅940177787.

It can be written as a sum of positive squares in 2 ways, for example, as 11498272900 + 1713049321 = 107230^2 + 41389^2 .

It is a cyclic number.

It is not a de Polignac number, because 13211322221 - 2¹⁴ = 13211305837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13211322193 and 13211322202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211322227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070936 + ... + 1083201.

It is an arithmetic number, because the mean of its divisors is an integer number (3303370623).

Almost surely, 2^13211322221 is an apocalyptic number.

It is an amenable number.

13211322221 is a deficient number, since it is larger than the sum of its proper divisors (2160271).

13211322221 is an equidigital number, since it uses as much as digits as its factorization.

13211322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160270.

The product of its digits is 288, while the sum is 20.

Adding to 13211322221 its reverse (12222311231), we get a palindrome (25433633452).

The spelling of 13211322221 in words is "thirteen billion, two hundred eleven million, three hundred twenty-two thousand, two hundred twenty-one".