121343240 has 16 divisors (see below), whose sum is σ = 273022380. Its totient is φ = 48537280.

The previous prime is 121343227. The next prime is 121343273. The reversal of 121343240 is 42343121.

It can be written as a sum of positive squares in 2 ways, for example, as 111218116 + 10125124 = 10546^2 + 3182^2 .

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 3 ways as a sum of consecutive naturals, for example, 1516751 + ... + 1516830.

Almost surely, 2^121343240 is an apocalyptic number.

121343240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121343240 is an abundant number, since it is smaller than the sum of its proper divisors (151679140).

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

121343240 is a wasteful number, since it uses less digits than its factorization.

121343240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033592 (or 3033588 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 121343240 is about 11015.5907694504. The cubic root of 121343240 is about 495.0759873823.

Adding to 121343240 its reverse (42343121), we get a palindrome (163686361).

The spelling of 121343240 in words is "one hundred twenty-one million, three hundred forty-three thousand, two hundred forty".