13211221012221 has 32 divisors (see below), whose sum is σ = 18364152764160. Its totient is φ = 8437806454784.

The previous prime is 13211221012153. The next prime is 13211221012229. The reversal of 13211221012221 is 12221012211231.

It is a cyclic number.

It is not a de Polignac number, because 13211221012221 - 2²⁹ = 13210684141309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211221012229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6698125 + ... + 8443181.

It is an arithmetic number, because the mean of its divisors is an integer number (573879773880).

Almost surely, 2^{13211221012221} is an apocalyptic number.

It is an amenable number.

13211221012221 is a deficient number, since it is larger than the sum of its proper divisors (5152931751939).

13211221012221 is a wasteful number, since it uses less digits than its factorization.

13211221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745765.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 13211221012221 its reverse (12221012211231), we get a palindrome (25432233223452).

The spelling of 13211221012221 in words is "thirteen trillion, two hundred eleven billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".