43983913421 has 16 divisors (see below), whose sum is σ = 51131965440. Its totient is φ = 37053002880.

The previous prime is 43983913417. The next prime is 43983913423. The reversal of 43983913421 is 12431938934.

It is a happy number.

43983913421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 43983913421 - 2² = 43983913417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43983913423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505865 + ... + 586401.

It is an arithmetic number, because the mean of its divisors is an integer number (3195747840).

Almost surely, 2^43983913421 is an apocalyptic number.

It is an amenable number.

43983913421 is a deficient number, since it is larger than the sum of its proper divisors (7148052019).

43983913421 is a wasteful number, since it uses less digits than its factorization.

43983913421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81884.

The product of its digits is 559872, while the sum is 47.

The spelling of 43983913421 in words is "forty-three billion, nine hundred eighty-three million, nine hundred thirteen thousand, four hundred twenty-one".