228321213 has 4 divisors (see below), whose sum is σ = 304428288. Its totient is φ = 152214140.

The previous prime is 228321199. The next prime is 228321217. The reversal of 228321213 is 312123822.

It is a happy number.

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 228321213 - 2¹⁰ = 228320189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228321217) 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, 38053533 + ... + 38053538.

It is an arithmetic number, because the mean of its divisors is an integer number (76107072).

Almost surely, 2^228321213 is an apocalyptic number.

It is an amenable number.

228321213 is a deficient number, since it is larger than the sum of its proper divisors (76107075).

228321213 is an equidigital number, since it uses as much as digits as its factorization.

228321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76107074.

The product of its digits is 1152, while the sum is 24.

The square root of 228321213 is about 15110.3015522524. The cubic root of 228321213 is about 611.1982297312.

The spelling of 228321213 in words is "two hundred twenty-eight million, three hundred twenty-one thousand, two hundred thirteen".