13895837721 has 12 divisors (see below), whose sum is σ = 20371345072. Its totient is φ = 9125624376.

The previous prime is 13895837717. The next prime is 13895837737. The reversal of 13895837721 is 12773859831.

It is a happy number.

13895837721 is a `hidden beast` number, since 1 + 38 + 9 + 583 + 7 + 7 + 21 = 666.

It is not a de Polignac number, because 13895837721 - 2² = 13895837717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13895837741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11521651 + ... + 11522856.

Almost surely, 2^13895837721 is an apocalyptic number.

It is an amenable number.

13895837721 is a deficient number, since it is larger than the sum of its proper divisors (6475507351).

13895837721 is a wasteful number, since it uses less digits than its factorization.

13895837721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23044580 (or 23044577 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 13895837721 in words is "thirteen billion, eight hundred ninety-five million, eight hundred thirty-seven thousand, seven hundred twenty-one".