221132220 has 48 divisors (see below), whose sum is σ = 622140288. Its totient is φ = 58685760.

The previous prime is 221132167. The next prime is 221132251. The reversal of 221132220 is 22231122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221132220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3927 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (12961256).

Almost surely, 2^221132220 is an apocalyptic number.

221132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221132220 is an abundant number, since it is smaller than the sum of its proper divisors (401008068).

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

221132220 is a wasteful number, since it uses less digits than its factorization.

221132220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17690 (or 17688 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221132220 is about 14870.5151222142. The cubic root of 221132220 is about 604.7149079111.

Adding to 221132220 its reverse (22231122), we get a palindrome (243363342).

The spelling of 221132220 in words is "two hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty".