221223213 has 24 divisors (see below), whose sum is σ = 341400800. Its totient is φ = 137627424.

The previous prime is 221223209. The next prime is 221223221. The reversal of 221223213 is 312322122.

It is not a de Polignac number, because 221223213 - 2² = 221223209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1803 + ... + 21111.

Almost surely, 2^221223213 is an apocalyptic number.

It is an amenable number.

221223213 is a deficient number, since it is larger than the sum of its proper divisors (120177587).

221223213 is a wasteful number, since it uses less digits than its factorization.

221223213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19401 (or 19398 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 221223213 is about 14873.5743182330. The cubic root of 221223213 is about 604.7978406139.

Adding to 221223213 its reverse (312322122), we get a palindrome (533545335).

It can be divided in two parts, 2212 and 23213, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 221223213 in words is "two hundred twenty-one million, two hundred twenty-three thousand, two hundred thirteen".