121503020440 has 16 divisors (see below), whose sum is σ = 273381796080. Its totient is φ = 48601208160.

The previous prime is 121503020417. The next prime is 121503020461. The reversal of 121503020440 is 44020305121.

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 3 ways as a sum of consecutive naturals, for example, 1518787716 + ... + 1518787795.

It is an arithmetic number, because the mean of its divisors is an integer number (17086362255).

Almost surely, 2^121503020440 is an apocalyptic number.

121503020440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121503020440 is an abundant number, since it is smaller than the sum of its proper divisors (151878775640).

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

121503020440 is a wasteful number, since it uses less digits than its factorization.

121503020440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037575522 (or 3037575518 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 121503020440 its reverse (44020305121), we get a palindrome (165523325561).

The spelling of 121503020440 in words is "one hundred twenty-one billion, five hundred three million, twenty thousand, four hundred forty".