43861480021 has 4 divisors (see below), whose sum is σ = 43886588512. Its totient is φ = 43836371532.

The previous prime is 43861480007. The next prime is 43861480049. The reversal of 43861480021 is 12008416834.

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 a cyclic number.

It is not a de Polignac number, because 43861480021 - 2⁹ = 43861479509 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 (43861480721) 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, 12551625 + ... + 12555118.

It is an arithmetic number, because the mean of its divisors is an integer number (10971647128).

Almost surely, 2^43861480021 is an apocalyptic number.

It is an amenable number.

43861480021 is a deficient number, since it is larger than the sum of its proper divisors (25108491).

43861480021 is a wasteful number, since it uses less digits than its factorization.

43861480021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25108490.

The product of its (nonzero) digits is 36864, while the sum is 37.

Adding to 43861480021 its reverse (12008416834), we get a palindrome (55869896855).

The spelling of 43861480021 in words is "forty-three billion, eight hundred sixty-one million, four hundred eighty thousand, twenty-one".