43868744721 has 20 divisors (see below), whose sum is σ = 68381556672. Its totient is φ = 27974270808.

The previous prime is 43868744683. The next prime is 43868744723. The reversal of 43868744721 is 12744786834.

43868744721 is a `hidden beast` number, since 43 + 8 + 68 + 74 + 472 + 1 = 666.

43868744721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43868744721 - 2⁷ = 43868744593 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (43868744723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11771821 + ... + 11775546.

Almost surely, 2^43868744721 is an apocalyptic number.

It is an amenable number.

43868744721 is a deficient number, since it is larger than the sum of its proper divisors (24512811951).

43868744721 is a wasteful number, since it uses less digits than its factorization.

43868744721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23547402 (or 23547393 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 54.

The spelling of 43868744721 in words is "forty-three billion, eight hundred sixty-eight million, seven hundred forty-four thousand, seven hundred twenty-one".