12721158187440 has 80 divisors (see below), whose sum is σ = 40352697166848. Its totient is φ = 3313417943808.

The previous prime is 12721158187393. The next prime is 12721158187453. The reversal of 12721158187440 is 4478185112721.

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

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, 616324864 + ... + 616345503.

Almost surely, 2^{12721158187440} is an apocalyptic number.

12721158187440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721158187440 is an abundant number, since it is smaller than the sum of its proper divisors (27631538979408).

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

12721158187440 is a wasteful number, since it uses less digits than its factorization.

12721158187440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232670426 (or 1232670420 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 12721158187440 in words is "twelve trillion, seven hundred twenty-one billion, one hundred fifty-eight million, one hundred eighty-seven thousand, four hundred forty".