121481556840 has 256 divisors, whose sum is σ = 475295731200. Its totient is φ = 27016685568.

The previous prime is 121481556821. The next prime is 121481556893. The reversal of 121481556840 is 48655184121.

121481556840 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 81 + 5 + 568 + 4 + 0 = 666.

121481556840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62572 + ... + 496868.

It is an arithmetic number, because the mean of its divisors is an integer number (1856623950).

Almost surely, 2^121481556840 is an apocalyptic number.

121481556840 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 121481556840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237647865600).

121481556840 is an abundant number, since it is smaller than the sum of its proper divisors (353814174360).

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

121481556840 is a wasteful number, since it uses less digits than its factorization.

121481556840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434361 (or 434351 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The spelling of 121481556840 in words is "one hundred twenty-one billion, four hundred eighty-one million, five hundred fifty-six thousand, eight hundred forty".