221330140 has 24 divisors (see below), whose sum is σ = 492134832. Its totient is φ = 83324160.

The previous prime is 221330129. The next prime is 221330141. The reversal of 221330140 is 41033122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325146 + ... + 325825.

It is an arithmetic number, because the mean of its divisors is an integer number (20505618).

Almost surely, 2^221330140 is an apocalyptic number.

221330140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221330140 is an abundant number, since it is smaller than the sum of its proper divisors (270804692).

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

221330140 is a wasteful number, since it uses less digits than its factorization.

221330140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650997 (or 650995 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221330140 is about 14877.1684133776. The cubic root of 221330140 is about 604.8952668008.

Adding to 221330140 its reverse (41033122), we get a palindrome (262363262).

The spelling of 221330140 in words is "two hundred twenty-one million, three hundred thirty thousand, one hundred forty".