213221232 has 120 divisors (see below), whose sum is σ = 700523616. Its totient is φ = 59263488.

The previous prime is 213221209. The next prime is 213221243. The reversal of 213221232 is 232122312.

213221232 is a `hidden beast` number, since 213 + 221 + 232 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34438 + ... + 40154.

Almost surely, 2^213221232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213221232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350261808).

213221232 is an abundant number, since it is smaller than the sum of its proper divisors (487302384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213221232 is a wasteful number, since it uses less digits than its factorization.

213221232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775 (or 5766 counting only the distinct ones).

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

The square root of 213221232 is about 14602.0968357288. The cubic root of 213221232 is about 597.4159538186.

Adding to 213221232 its reverse (232122312), we get a palindrome (445343544).

It can be divided in two parts, 213 and 221232, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 213221232 in words is "two hundred thirteen million, two hundred twenty-one thousand, two hundred thirty-two".