121540044 has 48 divisors (see below), whose sum is σ = 294577920. Its totient is φ = 38955840.

The previous prime is 121540039. The next prime is 121540063. The reversal of 121540044 is 440045121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121540044.

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, 107667 + ... + 108789.

It is an arithmetic number, because the mean of its divisors is an integer number (6137040).

Almost surely, 2^121540044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121540044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147288960).

121540044 is an abundant number, since it is smaller than the sum of its proper divisors (173037876).

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

121540044 is a wasteful number, since it uses less digits than its factorization.

121540044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1468 counting only the distinct ones).

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

The square root of 121540044 is about 11024.5201256109. The cubic root of 121540044 is about 495.3434938574.

Adding to 121540044 its reverse (440045121), we get a palindrome (561585165).

The spelling of 121540044 in words is "one hundred twenty-one million, five hundred forty thousand, forty-four".