43728083221 has 4 divisors (see below), whose sum is σ = 43902298944. Its totient is φ = 43553867500.

The previous prime is 43728083183. The next prime is 43728083237. The reversal of 43728083221 is 12238082734.

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 43728083221 - 2²¹ = 43725986069 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43728483221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87107485 + ... + 87107986.

It is an arithmetic number, because the mean of its divisors is an integer number (10975574736).

Almost surely, 2^43728083221 is an apocalyptic number.

It is an amenable number.

43728083221 is a deficient number, since it is larger than the sum of its proper divisors (174215723).

43728083221 is a wasteful number, since it uses less digits than its factorization.

43728083221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174215722.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 43728083221 in words is "forty-three billion, seven hundred twenty-eight million, eighty-three thousand, two hundred twenty-one".