121540553144 has 16 divisors (see below), whose sum is σ = 227892845520. Its totient is φ = 60769127680.

The previous prime is 121540553143. The next prime is 121540553159. The reversal of 121540553144 is 441355045121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540553143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450632 + ... + 667944.

It is an arithmetic number, because the mean of its divisors is an integer number (14243302845).

Almost surely, 2^121540553144 is an apocalyptic number.

It is an amenable number.

121540553144 is a deficient number, since it is larger than the sum of its proper divisors (106352292376).

121540553144 is a wasteful number, since it uses less digits than its factorization.

121540553144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287230 (or 287226 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 121540553144 its reverse (441355045121), we get a palindrome (562895598265).

The spelling of 121540553144 in words is "one hundred twenty-one billion, five hundred forty million, five hundred fifty-three thousand, one hundred forty-four".