213111030221 has 4 divisors (see below), whose sum is σ = 213132967200. Its totient is φ = 213089093244.

The previous prime is 213111030217. The next prime is 213111030227. The reversal of 213111030221 is 122030111312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213111030221 - 2² = 213111030217 is a prime.

It is a super-2 number, since 2×213111030221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213111030221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111030227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10953911 + ... + 10973348.

It is an arithmetic number, because the mean of its divisors is an integer number (53283241800).

Almost surely, 2^213111030221 is an apocalyptic number.

It is an amenable number.

213111030221 is a deficient number, since it is larger than the sum of its proper divisors (21936979).

213111030221 is an equidigital number, since it uses as much as digits as its factorization.

213111030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21936978.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213111030221 its reverse (122030111312), we get a palindrome (335141141533).

The spelling of 213111030221 in words is "two hundred thirteen billion, one hundred eleven million, thirty thousand, two hundred twenty-one".