121543502040 has 192 divisors, whose sum is σ = 406409983200. Its totient is φ = 31490021376.

The previous prime is 121543501991. The next prime is 121543502071. The reversal of 121543502040 is 40205345121.

121543502040 is a `hidden beast` number, since 1 + 2 + 154 + 3 + 502 + 0 + 4 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 121543501995 and 121543502013.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1726246 + ... + 1795274.

Almost surely, 2^121543502040 is an apocalyptic number.

121543502040 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 121543502040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203204991600).

121543502040 is an abundant number, since it is smaller than the sum of its proper divisors (284866481160).

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

121543502040 is a wasteful number, since it uses less digits than its factorization.

121543502040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69186 (or 69179 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 121543502040 its reverse (40205345121), we get a palindrome (161748847161).

The spelling of 121543502040 in words is "one hundred twenty-one billion, five hundred forty-three million, five hundred two thousand, forty".