43049743721 has 4 divisors (see below), whose sum is σ = 43084546692. Its totient is φ = 43014940752.

The previous prime is 43049743703. The next prime is 43049743811. The reversal of 43049743721 is 12734794034.

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 22381656025 + 20668087696 = 149605^2 + 143764^2 .

It is a cyclic number.

It is not a de Polignac number, because 43049743721 - 2⁶ = 43049743657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43049743421) 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, 17399630 + ... + 17402103.

It is an arithmetic number, because the mean of its divisors is an integer number (10771136673).

Almost surely, 2^43049743721 is an apocalyptic number.

It is an amenable number.

43049743721 is a deficient number, since it is larger than the sum of its proper divisors (34802971).

43049743721 is a wasteful number, since it uses less digits than its factorization.

43049743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34802970.

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 43049743721 in words is "forty-three billion, forty-nine million, seven hundred forty-three thousand, seven hundred twenty-one".