121443140 has 96 divisors (see below), whose sum is σ = 320060160. Its totient is φ = 37679616.

The previous prime is 121443103. The next prime is 121443163. The reversal of 121443140 is 41344121.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 31 ways as a sum of consecutive naturals, for example, 95831 + ... + 97089.

It is an arithmetic number, because the mean of its divisors is an integer number (3333960).

Almost surely, 2^121443140 is an apocalyptic number.

121443140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121443140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160030080).

121443140 is an abundant number, since it is smaller than the sum of its proper divisors (198617020).

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

121443140 is a wasteful number, since it uses less digits than its factorization.

121443140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 121443140 is about 11020.1243187180. The cubic root of 121443140 is about 495.2118128986.

Adding to 121443140 its reverse (41344121), we get a palindrome (162787261).

The spelling of 121443140 in words is "one hundred twenty-one million, four hundred forty-three thousand, one hundred forty".