13213211221 has 8 divisors (see below), whose sum is σ = 15102560384. Its totient is φ = 11324298960.

The previous prime is 13213211201. The next prime is 13213211237. The reversal of 13213211221 is 12211231231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13213211221 - 2¹⁹ = 13212686933 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 (13213211201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41625 + ... + 167806.

It is an arithmetic number, because the mean of its divisors is an integer number (1887820048).

Almost surely, 2^13213211221 is an apocalyptic number.

It is an amenable number.

13213211221 is a deficient number, since it is larger than the sum of its proper divisors (1889349163).

13213211221 is an equidigital number, since it uses as much as digits as its factorization.

13213211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218451.

The product of its digits is 144, while the sum is 19.

Adding to 13213211221 its reverse (12211231231), we get a palindrome (25424442452).

The spelling of 13213211221 in words is "thirteen billion, two hundred thirteen million, two hundred eleven thousand, two hundred twenty-one".