221132052 has 72 divisors (see below), whose sum is σ = 594110720. Its totient is φ = 71055360.

The previous prime is 221132033. The next prime is 221132053. The reversal of 221132052 is 250231122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221132053) 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, 860308 + ... + 860564.

Almost surely, 2^221132052 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 221132052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297055360).

221132052 is an abundant number, since it is smaller than the sum of its proper divisors (372978668).

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

221132052 is a wasteful number, since it uses less digits than its factorization.

221132052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221132052 is about 14870.5094734511. The cubic root of 221132052 is about 604.7147547718.

Adding to 221132052 its reverse (250231122), we get a palindrome (471363174).

The spelling of 221132052 in words is "two hundred twenty-one million, one hundred thirty-two thousand, fifty-two".