121143440 has 160 divisors (see below), whose sum is σ = 327836160. Its totient is φ = 41216000.

The previous prime is 121143431. The next prime is 121143493. The reversal of 121143440 is 44341121.

It is a super-3 number, since 3×121143440³ (a number of 25 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1199390 + ... + 1199490.

It is an arithmetic number, because the mean of its divisors is an integer number (2048976).

Almost surely, 2^121143440 is an apocalyptic number.

121143440 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 121143440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163918080).

121143440 is an abundant number, since it is smaller than the sum of its proper divisors (206692720).

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

121143440 is a wasteful number, since it uses less digits than its factorization.

121143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 195 counting only the distinct ones).

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

The square root of 121143440 is about 11006.5180688536. The cubic root of 121143440 is about 494.8041125399.

Adding to 121143440 its reverse (44341121), we get a palindrome (165484561).

The spelling of 121143440 in words is "one hundred twenty-one million, one hundred forty-three thousand, four hundred forty".