121808403858000 has 80 divisors (see below), whose sum is σ = 392710294057536. Its totient is φ = 32482241027200.

The previous prime is 121808403857941. The next prime is 121808403858007. The reversal of 121808403858000 is 858304808121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121808403858007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10150694322 + ... + 10150706321.

Almost surely, 2^{121808403858000} is an apocalyptic number.

121808403858000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121808403858000 is an abundant number, since it is smaller than the sum of its proper divisors (270901890199536).

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

121808403858000 is a wasteful number, since it uses less digits than its factorization.

121808403858000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20301400669 (or 20301400653 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 121808403858000 in words is "one hundred twenty-one trillion, eight hundred eight billion, four hundred three million, eight hundred fifty-eight thousand".