43041243121 has 4 divisors (see below), whose sum is σ = 43044175332. Its totient is φ = 43038310912.

The previous prime is 43041243079. The next prime is 43041243137. The reversal of 43041243121 is 12134214034.

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 11655577521 + 31385665600 = 107961^2 + 177160^2 .

It is a cyclic number.

It is not a de Polignac number, because 43041243121 - 2⁹ = 43041242609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43041243221) 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, 1443976 + ... + 1473481.

It is an arithmetic number, because the mean of its divisors is an integer number (10761043833).

Almost surely, 2^43041243121 is an apocalyptic number.

It is an amenable number.

43041243121 is a deficient number, since it is larger than the sum of its proper divisors (2932211).

43041243121 is a wasteful number, since it uses less digits than its factorization.

43041243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932210.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 43041243121 its reverse (12134214034), we get a palindrome (55175457155).

The spelling of 43041243121 in words is "forty-three billion, forty-one million, two hundred forty-three thousand, one hundred twenty-one".