13211232021221 has 16 divisors (see below), whose sum is σ = 14847808241280. Its totient is φ = 11663398422720.

The previous prime is 13211232021167. The next prime is 13211232021257. The reversal of 13211232021221 is 12212023211231.

It is a cyclic number.

It is not a de Polignac number, because 13211232021221 - 2¹⁴ = 13211232004837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211232021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34070 + ... + 5140391.

It is an arithmetic number, because the mean of its divisors is an integer number (927988015080).

Almost surely, 2^{13211232021221} is an apocalyptic number.

It is an amenable number.

13211232021221 is a deficient number, since it is larger than the sum of its proper divisors (1636576220059).

13211232021221 is a wasteful number, since it uses less digits than its factorization.

13211232021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183036.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 13211232021221 its reverse (12212023211231), we get a palindrome (25423255232452).

The spelling of 13211232021221 in words is "thirteen trillion, two hundred eleven billion, two hundred thirty-two million, twenty-one thousand, two hundred twenty-one".