13211332221 has 16 divisors (see below), whose sum is σ = 18361221824. Its totient is φ = 8441604864.

The previous prime is 13211332219. The next prime is 13211332223. The reversal of 13211332221 is 12223311231.

It is an interprime number because it is at equal distance from previous prime (13211332219) and next prime (13211332223).

It is not a de Polignac number, because 13211332221 - 2¹ = 13211332219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211332223) 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, 880780 + ... + 895653.

It is an arithmetic number, because the mean of its divisors is an integer number (1147576364).

Almost surely, 2^13211332221 is an apocalyptic number.

It is an amenable number.

13211332221 is a deficient number, since it is larger than the sum of its proper divisors (5149889603).

13211332221 is a wasteful number, since it uses less digits than its factorization.

13211332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776540.

The product of its digits is 432, while the sum is 21.

Adding to 13211332221 its reverse (12223311231), we get a palindrome (25434643452).

The spelling of 13211332221 in words is "thirteen billion, two hundred eleven million, three hundred thirty-two thousand, two hundred twenty-one".