13121991288 has 384 divisors, whose sum is σ = 43400448000. Its totient is φ = 3503831040.

The previous prime is 13121991287. The next prime is 13121991293. The reversal of 13121991288 is 88219912131.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121991287) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 57301158 + ... + 57301386.

It is an arithmetic number, because the mean of its divisors is an integer number (113022000).

Almost surely, 2^13121991288 is an apocalyptic number.

13121991288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13121991288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21700224000).

13121991288 is an abundant number, since it is smaller than the sum of its proper divisors (30278456712).

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

13121991288 is a wasteful number, since it uses less digits than its factorization.

13121991288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 388 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The spelling of 13121991288 in words is "thirteen billion, one hundred twenty-one million, nine hundred ninety-one thousand, two hundred eighty-eight".