121971220189840 has 80 divisors (see below), whose sum is σ = 324144423750528. Its totient is φ = 41812321195008.

The previous prime is 121971220189831. The next prime is 121971220189921. The reversal of 121971220189840 is 48981022179121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12949102 + ... + 20288461.

Almost surely, 2^{121971220189840} is an apocalyptic number.

121971220189840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121971220189840 is an abundant number, since it is smaller than the sum of its proper divisors (202173203560688).

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

121971220189840 is a wasteful number, since it uses less digits than its factorization.

121971220189840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33244136 (or 33244130 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 55.

The spelling of 121971220189840 in words is "one hundred twenty-one trillion, nine hundred seventy-one billion, two hundred twenty million, one hundred eighty-nine thousand, eight hundred forty".