221100213 has 4 divisors (see below), whose sum is σ = 294800288. Its totient is φ = 147400140.

The previous prime is 221100203. The next prime is 221100227. The reversal of 221100213 is 312001122.

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 not a de Polignac number, because 221100213 - 2¹⁶ = 221034677 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 (221100203) 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, 36850033 + ... + 36850038.

It is an arithmetic number, because the mean of its divisors is an integer number (73700072).

Almost surely, 2^221100213 is an apocalyptic number.

It is an amenable number.

221100213 is a deficient number, since it is larger than the sum of its proper divisors (73700075).

221100213 is an equidigital number, since it uses as much as digits as its factorization.

221100213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700074.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221100213 is about 14869.4388932468. The cubic root of 221100213 is about 604.6857307308.

Adding to 221100213 its reverse (312001122), we get a palindrome (533101335).

Subtracting 221100213 from its reverse (312001122), we obtain a palindrome (90900909).

The spelling of 221100213 in words is "two hundred twenty-one million, one hundred thousand, two hundred thirteen".