121143240 has 192 divisors, whose sum is σ = 421200000. Its totient is φ = 30108672.

The previous prime is 121143227. The next prime is 121143247. The reversal of 121143240 is 42341121.

It is a super-3 number, since 3×121143240³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121143247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 608661 + ... + 608859.

It is an arithmetic number, because the mean of its divisors is an integer number (2193750).

Almost surely, 2^121143240 is an apocalyptic number.

121143240 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 121143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210600000).

121143240 is an abundant number, since it is smaller than the sum of its proper divisors (300056760).

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

121143240 is a wasteful number, since it uses less digits than its factorization.

121143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 121143240 is about 11006.5089833244. The cubic root of 121143240 is about 494.8038402432.

Adding to 121143240 its reverse (42341121), we get a palindrome (163484361).

The spelling of 121143240 in words is "one hundred twenty-one million, one hundred forty-three thousand, two hundred forty".