13860756721 has 4 divisors (see below), whose sum is σ = 15840864832. Its totient is φ = 11880648612.

The previous prime is 13860756719. The next prime is 13860756751. The reversal of 13860756721 is 12765706831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13860756721 - 2¹ = 13860756719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13860756751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990054045 + ... + 990054058.

It is an arithmetic number, because the mean of its divisors is an integer number (3960216208).

Almost surely, 2^13860756721 is an apocalyptic number.

It is an amenable number.

13860756721 is a deficient number, since it is larger than the sum of its proper divisors (1980108111).

13860756721 is an equidigital number, since it uses as much as digits as its factorization.

13860756721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980108110.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 13860756721 in words is "thirteen billion, eight hundred sixty million, seven hundred fifty-six thousand, seven hundred twenty-one".