221331212213 has 16 divisors (see below), whose sum is σ = 231300174336. Its totient is φ = 211540792320.

The previous prime is 221331212203. The next prime is 221331212227. The reversal of 221331212213 is 312212133122.

It is a cyclic number.

It is not a de Polignac number, because 221331212213 - 2³⁴ = 204151343029 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 (221331212203) 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, 8820581 + ... + 8845637.

It is an arithmetic number, because the mean of its divisors is an integer number (14456260896).

Almost surely, 2^221331212213 is an apocalyptic number.

It is an amenable number.

221331212213 is a deficient number, since it is larger than the sum of its proper divisors (9968962123).

221331212213 is a wasteful number, since it uses less digits than its factorization.

221331212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28604.

The product of its digits is 864, while the sum is 23.

Adding to 221331212213 its reverse (312212133122), we get a palindrome (533543345335).

The spelling of 221331212213 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred twelve thousand, two hundred thirteen".