221121140 has 24 divisors (see below), whose sum is σ = 479334912. Its totient is φ = 85595040.

The previous prime is 221121137. The next prime is 221121163. The reversal of 221121140 is 41121122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 177704 + ... + 178943.

It is an arithmetic number, because the mean of its divisors is an integer number (19972288).

Almost surely, 2^221121140 is an apocalyptic number.

221121140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121140 is an abundant number, since it is smaller than the sum of its proper divisors (258213772).

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

221121140 is a wasteful number, since it uses less digits than its factorization.

221121140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356687 (or 356685 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 221121140 is about 14870.1425682473. The cubic root of 221121140 is about 604.7048078405.

Adding to 221121140 its reverse (41121122), we get a palindrome (262242262).

The spelling of 221121140 in words is "two hundred twenty-one million, one hundred twenty-one thousand, one hundred forty".