221224213 has 16 divisors (see below), whose sum is σ = 268686720. Its totient is φ = 177808896.

The previous prime is 221224193. The next prime is 221224231. The reversal of 221224213 is 312422122.

It is a cyclic number.

It is not a de Polignac number, because 221224213 - 2⁹ = 221223701 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 (221224273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30393 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (16792920).

Almost surely, 2^221224213 is an apocalyptic number.

It is an amenable number.

221224213 is a deficient number, since it is larger than the sum of its proper divisors (47462507).

221224213 is a wasteful number, since it uses less digits than its factorization.

221224213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its digits is 384, while the sum is 19.

The square root of 221224213 is about 14873.6079348623. The cubic root of 221224213 is about 604.7987519060.

Adding to 221224213 its reverse (312422122), we get a palindrome (533646335).

It can be divided in two parts, 22122 and 4213, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 221224213 in words is "two hundred twenty-one million, two hundred twenty-four thousand, two hundred thirteen".