221233213 has 4 divisors (see below), whose sum is σ = 221340028. Its totient is φ = 221126400.

The previous prime is 221233163. The next prime is 221233241. The reversal of 221233213 is 312332122.

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 64432729 + 156800484 = 8027^2 + 12522^2 .

It is a cyclic number.

It is not a de Polignac number, because 221233213 - 2⁹ = 221232701 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 (221233273) 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, 50238 + ... + 54463.

It is an arithmetic number, because the mean of its divisors is an integer number (55335007).

Almost surely, 2^221233213 is an apocalyptic number.

It is an amenable number.

221233213 is a deficient number, since it is larger than the sum of its proper divisors (106815).

221233213 is a wasteful number, since it uses less digits than its factorization.

221233213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106814.

The product of its digits is 432, while the sum is 19.

The square root of 221233213 is about 14873.9104811075. The cubic root of 221233213 is about 604.8069534118.

Adding to 221233213 its reverse (312332122), we get a palindrome (533565335).

It can be divided in two parts, 22 and 1233213, that added together give a triangular number (1233235 = T₁₅₇₀).

The spelling of 221233213 in words is "two hundred twenty-one million, two hundred thirty-three thousand, two hundred thirteen".