12971245840 has 160 divisors (see below), whose sum is σ = 35401234176. Its totient is φ = 4327464960.

The previous prime is 12971245799. The next prime is 12971245901. The reversal of 12971245840 is 4854217921.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7536180 + ... + 7537900.

Almost surely, 2^12971245840 is an apocalyptic number.

12971245840 is a gapful number since it is divisible by the number (10) 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 12971245840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17700617088).

12971245840 is an abundant number, since it is smaller than the sum of its proper divisors (22429988336).

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

12971245840 is a wasteful number, since it uses less digits than its factorization.

12971245840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097 (or 2091 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 12971245840 in words is "twelve billion, nine hundred seventy-one million, two hundred forty-five thousand, eight hundred forty".