121891521880 has 16 divisors (see below), whose sum is σ = 274255924320. Its totient is φ = 48756608736.

The previous prime is 121891521877. The next prime is 121891521937. The reversal of 121891521880 is 88125198121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121891521880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523643984 + ... + 1523644063.

It is an arithmetic number, because the mean of its divisors is an integer number (17140995270).

Almost surely, 2^121891521880 is an apocalyptic number.

121891521880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121891521880 is an abundant number, since it is smaller than the sum of its proper divisors (152364402440).

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

121891521880 is a wasteful number, since it uses less digits than its factorization.

121891521880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047288058 (or 3047288054 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 46.

The spelling of 121891521880 in words is "one hundred twenty-one billion, eight hundred ninety-one million, five hundred twenty-one thousand, eight hundred eighty".