121018807840 has 384 divisors, whose sum is σ = 345494274048. Its totient is φ = 39194910720.

The previous prime is 121018807787. The next prime is 121018807843. The reversal of 121018807840 is 48708810121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 121018807793 and 121018807802.

It is not an unprimeable number, because it can be changed into a prime (121018807843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 329751337 + ... + 329751703.

It is an arithmetic number, because the mean of its divisors is an integer number (899724672).

Almost surely, 2^121018807840 is an apocalyptic number.

121018807840 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 121018807840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172747137024).

121018807840 is an abundant number, since it is smaller than the sum of its proper divisors (224475466208).

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

121018807840 is a wasteful number, since it uses less digits than its factorization.

121018807840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 40.

The spelling of 121018807840 in words is "one hundred twenty-one billion, eighteen million, eight hundred seven thousand, eight hundred forty".