13211334204221 has 16 divisors (see below), whose sum is σ = 13422982964160. Its totient is φ = 13001428661760.

The previous prime is 13211334204203. The next prime is 13211334204293. The reversal of 13211334204221 is 12240243311231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13211334204221 - 2²⁶ = 13211267095357 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 (13211334206221) 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, 11947991 + ... + 13006811.

It is an arithmetic number, because the mean of its divisors is an integer number (838936435260).

Almost surely, 2^{13211334204221} is an apocalyptic number.

It is an amenable number.

13211334204221 is a deficient number, since it is larger than the sum of its proper divisors (211648759939).

13211334204221 is a wasteful number, since it uses less digits than its factorization.

13211334204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059644.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 13211334204221 its reverse (12240243311231), we get a palindrome (25451577515452).

The spelling of 13211334204221 in words is "thirteen trillion, two hundred eleven billion, three hundred thirty-four million, two hundred four thousand, two hundred twenty-one".