213201311221 has 16 divisors (see below), whose sum is σ = 228492472320. Its totient is φ = 198437937280.

The previous prime is 213201311131. The next prime is 213201311231. The reversal of 213201311221 is 122113102312.

It is a cyclic number.

It is not a de Polignac number, because 213201311221 - 2¹¹ = 213201309173 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 (213201311231) 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, 66015 + ... + 656323.

It is an arithmetic number, because the mean of its divisors is an integer number (14280779520).

Almost surely, 2^213201311221 is an apocalyptic number.

It is an amenable number.

213201311221 is a deficient number, since it is larger than the sum of its proper divisors (15291161099).

213201311221 is a wasteful number, since it uses less digits than its factorization.

213201311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590756.

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

Adding to 213201311221 its reverse (122113102312), we get a palindrome (335314413533).

The spelling of 213201311221 in words is "two hundred thirteen billion, two hundred one million, three hundred eleven thousand, two hundred twenty-one".