221340132 has 72 divisors (see below), whose sum is σ = 628764864. Its totient is φ = 65140416.

The previous prime is 221340131. The next prime is 221340143. The reversal of 221340132 is 231043122.

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

It is not an unprimeable number, because it can be changed into a prime (221340131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483 + ... + 21045.

Almost surely, 2^221340132 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 221340132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314382432).

221340132 is an abundant number, since it is smaller than the sum of its proper divisors (407424732).

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

221340132 is a wasteful number, since it uses less digits than its factorization.

221340132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20609 (or 20604 counting only the distinct ones).

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

The square root of 221340132 is about 14877.5042261799. The cubic root of 221340132 is about 604.9043693758.

Adding to 221340132 its reverse (231043122), we get a palindrome (452383254).

The spelling of 221340132 in words is "two hundred twenty-one million, three hundred forty thousand, one hundred thirty-two".