121042240 has 112 divisors (see below), whose sum is σ = 317991744. Its totient is φ = 43520000.

The previous prime is 121042237. The next prime is 121042241. The reversal of 121042240 is 42240121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121042241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482115 + ... + 482365.

It is an arithmetic number, because the mean of its divisors is an integer number (2839212).

Almost surely, 2^121042240 is an apocalyptic number.

121042240 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 121042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158995872).

121042240 is an abundant number, since it is smaller than the sum of its proper divisors (196949504).

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

121042240 is a wasteful number, since it uses less digits than its factorization.

121042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 121042240 is about 11001.9198324656. The cubic root of 121042240 is about 494.6662921010. Note that the first 3 decimals are identical.

Adding to 121042240 its reverse (42240121), we get a palindrome (163282361).

The spelling of 121042240 in words is "one hundred twenty-one million, forty-two thousand, two hundred forty".