121577789617984 has 56 divisors (see below), whose sum is σ = 276083373509568. Its totient is φ = 52036298019840.

The previous prime is 121577789617961. The next prime is 121577789618063. The reversal of 121577789617984 is 489716987775121.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 121577789617898 and 121577789617907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177963274 + ... + 178645129.

Almost surely, 2^{121577789617984} is an apocalyptic number.

121577789617984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121577789617984 is an abundant number, since it is smaller than the sum of its proper divisors (154505583891584).

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

121577789617984 is an equidigital number, since it uses as much as digits as its factorization.

121577789617984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356609183 (or 356609173 counting only the distinct ones).

The product of its digits is 2987228160, while the sum is 82.

The spelling of 121577789617984 in words is "one hundred twenty-one trillion, five hundred seventy-seven billion, seven hundred eighty-nine million, six hundred seventeen thousand, nine hundred eighty-four".