121720543674648 has 32 divisors (see below), whose sum is σ = 314794509505200. Its totient is φ = 39174427849088.

The previous prime is 121720543674607. The next prime is 121720543674659. The reversal of 121720543674648 is 846476345027121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121720543674591 and 121720543674600.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 87442918611 + ... + 87442920002.

Almost surely, 2^{121720543674648} is an apocalyptic number.

It is an amenable number.

121720543674648 is an abundant number, since it is smaller than the sum of its proper divisors (193073965830552).

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

121720543674648 is a wasteful number, since it uses less digits than its factorization.

121720543674648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174885838651 (or 174885838647 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 60.

The spelling of 121720543674648 in words is "one hundred twenty-one trillion, seven hundred twenty billion, five hundred forty-three million, six hundred seventy-four thousand, six hundred forty-eight".