121131240 has 64 divisors (see below), whose sum is σ = 364124160. Its totient is φ = 32236800.

The previous prime is 121131223. The next prime is 121131281. The reversal of 121131240 is 42131121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104665 + ... + 105815.

It is an arithmetic number, because the mean of its divisors is an integer number (5689440).

Almost surely, 2^121131240 is an apocalyptic number.

121131240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131240 is an abundant number, since it is smaller than the sum of its proper divisors (242992920).

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

121131240 is a wasteful number, since it uses less digits than its factorization.

121131240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 121131240 is about 11005.9638378472. The cubic root of 121131240 is about 494.7875018927.

Adding to 121131240 its reverse (42131121), we get a palindrome (163262361).

The spelling of 121131240 in words is "one hundred twenty-one million, one hundred thirty-one thousand, two hundred forty".