221030213 has 4 divisors (see below), whose sum is σ = 221290188. Its totient is φ = 220770240.

The previous prime is 221030179. The next prime is 221030231. The reversal of 221030213 is 312030122.

It is a happy number.

221030213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109474369 + 111555844 = 10463^2 + 10562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221030213 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 (221030263) 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, 128708 + ... + 130413.

It is an arithmetic number, because the mean of its divisors is an integer number (55322547).

Almost surely, 2^221030213 is an apocalyptic number.

It is an amenable number.

221030213 is a deficient number, since it is larger than the sum of its proper divisors (259975).

221030213 is an equidigital number, since it uses as much as digits as its factorization.

221030213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259974.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221030213 is about 14867.0848857468. The cubic root of 221030213 is about 604.6219097929.

Adding to 221030213 its reverse (312030122), we get a palindrome (533060335).

Subtracting 221030213 from its reverse (312030122), we obtain a palindrome (90999909).

It can be divided in two parts, 2210 and 30213, that added together give a palindrome (32423).

The spelling of 221030213 in words is "two hundred twenty-one million, thirty thousand, two hundred thirteen".