121020209984 has 112 divisors (see below), whose sum is σ = 259190215680. Its totient is φ = 55879165440.

The previous prime is 121020209963. The next prime is 121020210013. The reversal of 121020209984 is 489902020121.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 15 ways as a sum of consecutive naturals, for example, 29436089 + ... + 29440199.

Almost surely, 2^121020209984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121020209984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129595107840).

121020209984 is an abundant number, since it is smaller than the sum of its proper divisors (138170005696).

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

121020209984 is a wasteful number, since it uses less digits than its factorization.

121020209984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4748 (or 4738 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 121020209984 in words is "one hundred twenty-one billion, twenty million, two hundred nine thousand, nine hundred eighty-four".