121987386488 has 64 divisors (see below), whose sum is σ = 252674899200. Its totient is φ = 54749390080.

The previous prime is 121987386449. The next prime is 121987386503. The reversal of 121987386488 is 884683789121.

It is a zygodrome in base 2.

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, 5808695 + ... + 5829657.

It is an arithmetic number, because the mean of its divisors is an integer number (3948045300).

Almost surely, 2^121987386488 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 121987386488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126337449600).

121987386488 is an abundant number, since it is smaller than the sum of its proper divisors (130687512712).

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

121987386488 is a wasteful number, since it uses less digits than its factorization.

121987386488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21812 (or 21808 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 65.

The spelling of 121987386488 in words is "one hundred twenty-one billion, nine hundred eighty-seven million, three hundred eighty-six thousand, four hundred eighty-eight".