43431400321 has 4 divisors (see below), whose sum is σ = 43442770644. Its totient is φ = 43420030000.

The previous prime is 43431400283. The next prime is 43431400333. The reversal of 43431400321 is 12300413434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12300413434 = 2 ⋅6150206717.

It can be written as a sum of positive squares in 2 ways, for example, as 29616689025 + 13814711296 = 172095^2 + 117536^2 .

It is a cyclic number.

It is not a de Polignac number, because 43431400321 - 2¹⁷ = 43431269249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43431400391) 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, 5679430 + ... + 5687071.

It is an arithmetic number, because the mean of its divisors is an integer number (10860692661).

Almost surely, 2^43431400321 is an apocalyptic number.

It is an amenable number.

43431400321 is a deficient number, since it is larger than the sum of its proper divisors (11370323).

43431400321 is a wasteful number, since it uses less digits than its factorization.

43431400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370322.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 43431400321 its reverse (12300413434), we get a palindrome (55731813755).

The spelling of 43431400321 in words is "forty-three billion, four hundred thirty-one million, four hundred thousand, three hundred twenty-one".