201221140 has 24 divisors (see below), whose sum is σ = 437136840. Its totient is φ = 77712768.

The previous prime is 201221113. The next prime is 201221143. The reversal of 201221140 is 41122102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17943696 + 183277444 = 4236^2 + 13538^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201221140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221143) 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, 172887 + ... + 174046.

It is an arithmetic number, because the mean of its divisors is an integer number (18214035).

Almost surely, 2^201221140 is an apocalyptic number.

201221140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221140 is an abundant number, since it is smaller than the sum of its proper divisors (235915700).

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

201221140 is a wasteful number, since it uses less digits than its factorization.

201221140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346971 (or 346969 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 201221140 is about 14185.2437412968. The cubic root of 201221140 is about 585.9913451412.

Adding to 201221140 its reverse (41122102), we get a palindrome (242343242).

The spelling of 201221140 in words is "two hundred one million, two hundred twenty-one thousand, one hundred forty".