121187729152 has 144 divisors (see below), whose sum is σ = 286800998400. Its totient is φ = 50027028480.

The previous prime is 121187729149. The next prime is 121187729171. The reversal of 121187729152 is 251927781121.

It is a congruent number.

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, 5793849 + ... + 5814727.

It is an arithmetic number, because the mean of its divisors is an integer number (1991673600).

Almost surely, 2^121187729152 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 121187729152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143400499200).

121187729152 is an abundant number, since it is smaller than the sum of its proper divisors (165613269248).

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

121187729152 is an equidigital number, since it uses as much as digits as its factorization.

121187729152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21022 (or 21008 counting only the distinct ones).

The product of its digits is 141120, while the sum is 46.

The spelling of 121187729152 in words is "one hundred twenty-one billion, one hundred eighty-seven million, seven hundred twenty-nine thousand, one hundred fifty-two".