213110013221 has 4 divisors (see below), whose sum is σ = 243554300832. Its totient is φ = 182665725612.

The previous prime is 213110013203. The next prime is 213110013251. The reversal of 213110013221 is 122310011312.

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 213110013221 - 2¹⁸ = 213109751077 is a prime.

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 213110013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213110013251) 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, 15222143795 + ... + 15222143808.

It is an arithmetic number, because the mean of its divisors is an integer number (60888575208).

Almost surely, 2^213110013221 is an apocalyptic number.

It is an amenable number.

213110013221 is a deficient number, since it is larger than the sum of its proper divisors (30444287611).

213110013221 is an equidigital number, since it uses as much as digits as its factorization.

213110013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30444287610.

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

Adding to 213110013221 its reverse (122310011312), we get a palindrome (335420024533).

The spelling of 213110013221 in words is "two hundred thirteen billion, one hundred ten million, thirteen thousand, two hundred twenty-one".