221232132 has 72 divisors (see below), whose sum is σ = 611974272. Its totient is φ = 66830400.

The previous prime is 221232127. The next prime is 221232133. The reversal of 221232132 is 231232122.

221232132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not an unprimeable number, because it can be changed into a prime (221232133) 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, 166053 + ... + 167379.

Almost surely, 2^221232132 is an apocalyptic number.

221232132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221232132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305987136).

221232132 is an abundant number, since it is smaller than the sum of its proper divisors (390742140).

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

221232132 is a wasteful number, since it uses less digits than its factorization.

221232132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769 (or 1764 counting only the distinct ones).

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

The square root of 221232132 is about 14873.8741422670. The cubic root of 221232132 is about 604.8059683315.

Adding to 221232132 its reverse (231232122), we get a palindrome (452464254).

The spelling of 221232132 in words is "two hundred twenty-one million, two hundred thirty-two thousand, one hundred thirty-two".