121540040540 has 48 divisors (see below), whose sum is σ = 257612019840. Its totient is φ = 48163476480.

The previous prime is 121540040509. The next prime is 121540040569. The reversal of 121540040540 is 45040045121.

It is a congruent number.

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, 5387885 + ... + 5410395.

It is an arithmetic number, because the mean of its divisors is an integer number (5366917080).

Almost surely, 2^121540040540 is an apocalyptic number.

121540040540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121540040540 is an abundant number, since it is smaller than the sum of its proper divisors (136071979300).

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

121540040540 is a wasteful number, since it uses less digits than its factorization.

121540040540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25022 (or 25020 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 121540040540 its reverse (45040045121), we get a palindrome (166580085661).

The spelling of 121540040540 in words is "one hundred twenty-one billion, five hundred forty million, forty thousand, five hundred forty".