213113223311221 has 8 divisors (see below), whose sum is σ = 213396759462744. Its totient is φ = 212829768426240.

The previous prime is 213113223311119. The next prime is 213113223311249. The reversal of 213113223311221 is 122113322311312.

It can be written as a sum of positive squares in 4 ways, for example, as 14234691406321 + 198878531904900 = 3772889^2 + 14102430^2 .

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 213113223311221 - 2⁹ = 213113223310709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213113223311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113223311281) 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, 15067450 + ... + 25558843.

It is an arithmetic number, because the mean of its divisors is an integer number (26674594932843).

Almost surely, 2^{213113223311221} is an apocalyptic number.

It is an amenable number.

213113223311221 is a deficient number, since it is larger than the sum of its proper divisors (283536151523).

213113223311221 is an equidigital number, since it uses as much as digits as its factorization.

213113223311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40633271.

The product of its digits is 2592, while the sum is 28.

Adding to 213113223311221 its reverse (122113322311312), we get a palindrome (335226545622533).

Subtracting from 213113223311221 its reverse (122113322311312), we obtain a palindrome (90999900999909).

The spelling of 213113223311221 in words is "two hundred thirteen trillion, one hundred thirteen billion, two hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".