221213 has 4 divisors (see below), whose sum is σ = 222780. Its totient is φ = 219648.

The previous prime is 221209. The next prime is 221219. The reversal of 221213 is 312122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312122 = 2 ⋅156061.

It can be written as a sum of positive squares in 2 ways, for example, as 24964 + 196249 = 158^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 221213 - 2² = 221209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221194 and 221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221219) 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, 548 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (55695).

2²²¹²¹³ is an apocalyptic number.

It is an amenable number.

221213 is a deficient number, since it is larger than the sum of its proper divisors (1567).

221213 is a wasteful number, since it uses less digits than its factorization.

221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566.

The product of its digits is 24, while the sum is 11.

The square root of 221213 is about 470.3328608549. The cubic root of 221213 is about 60.4788533430.

Adding to 221213 its reverse (312122), we get a palindrome (533335).

Subtracting 221213 from its reverse (312122), we obtain a palindrome (90909).

It can be divided in two parts, 221 and 213, that added together give a palindrome (434).

The spelling of 221213 in words is "two hundred twenty-one thousand, two hundred thirteen".