121442240040 has 128 divisors (see below), whose sum is σ = 399331883520. Its totient is φ = 29300947200.

The previous prime is 121442240027. The next prime is 121442240047. The reversal of 121442240040 is 40042244121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121442240047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60507 + ... + 496533.

It is an arithmetic number, because the mean of its divisors is an integer number (3119780340).

Almost surely, 2^121442240040 is an apocalyptic number.

121442240040 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 121442240040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199665941760).

121442240040 is an abundant number, since it is smaller than the sum of its proper divisors (277889643480).

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

121442240040 is a wasteful number, since it uses less digits than its factorization.

121442240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436263 (or 436259 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 121442240040 its reverse (40042244121), we get a palindrome (161484484161).

The spelling of 121442240040 in words is "one hundred twenty-one billion, four hundred forty-two million, two hundred forty thousand, forty".