13121815179440 has 80 divisors (see below), whose sum is σ = 33909651491616. Its totient is φ = 4681539532800.

The previous prime is 13121815179409. The next prime is 13121815179449. The reversal of 13121815179440 is 4497151812131.

13121815179440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (13121815179449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140624621 + ... + 140717900.

Almost surely, 2^{13121815179440} is an apocalyptic number.

13121815179440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121815179440 is an abundant number, since it is smaller than the sum of its proper divisors (20787836312176).

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

13121815179440 is a wasteful number, since it uses less digits than its factorization.

13121815179440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281342598 (or 281342592 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 13121815179440 in words is "thirteen trillion, one hundred twenty-one billion, eight hundred fifteen million, one hundred seventy-nine thousand, four hundred forty".