43000445021 has 4 divisors (see below), whose sum is σ = 43013047452. Its totient is φ = 42987842592.

The previous prime is 43000445011. The next prime is 43000445051. The reversal of 43000445021 is 12054400034.

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 37534800121 + 5465644900 = 193739^2 + 73930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43000445021 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 (43000445011) 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, 6296096 + ... + 6302921.

It is an arithmetic number, because the mean of its divisors is an integer number (10753261863).

Almost surely, 2^43000445021 is an apocalyptic number.

It is an amenable number.

43000445021 is a deficient number, since it is larger than the sum of its proper divisors (12602431).

43000445021 is a wasteful number, since it uses less digits than its factorization.

43000445021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12602430.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 43000445021 its reverse (12054400034), we get a palindrome (55054845055).

The spelling of 43000445021 in words is "forty-three billion, four hundred forty-five thousand, twenty-one".