121544040 has 64 divisors (see below), whose sum is σ = 366307200. Its totient is φ = 32262912.

The previous prime is 121544023. The next prime is 121544041. The reversal of 121544040 is 40445121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121543998 and 121544016.

It is not an unprimeable number, because it can be changed into a prime (121544041) 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, 25269 + ... + 29691.

It is an arithmetic number, because the mean of its divisors is an integer number (5723550).

Almost surely, 2^121544040 is an apocalyptic number.

121544040 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 121544040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183153600).

121544040 is an abundant number, since it is smaller than the sum of its proper divisors (244763160).

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

121544040 is a wasteful number, since it uses less digits than its factorization.

121544040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666 (or 4662 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 121544040 is about 11024.7013564994. The cubic root of 121544040 is about 495.3489224411.

Adding to 121544040 its reverse (40445121), we get a palindrome (161989161).

The spelling of 121544040 in words is "one hundred twenty-one million, five hundred forty-four thousand, forty".