43116721205 has 4 divisors (see below), whose sum is σ = 51740065452. Its totient is φ = 34493376960.

The previous prime is 43116721201. The next prime is 43116721211. The reversal of 43116721205 is 50212761134.

43116721205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13413577489 + 29703143716 = 115817^2 + 172346^2 .

It is not a de Polignac number, because 43116721205 - 2² = 43116721201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43116721201) 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, 4311672116 + ... + 4311672125.

It is an arithmetic number, because the mean of its divisors is an integer number (12935016363).

Almost surely, 2^43116721205 is an apocalyptic number.

It is an amenable number.

43116721205 is a deficient number, since it is larger than the sum of its proper divisors (8623344247).

43116721205 is an equidigital number, since it uses as much as digits as its factorization.

43116721205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8623344246.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 43116721205 in words is "forty-three billion, one hundred sixteen million, seven hundred twenty-one thousand, two hundred five".