43423121331 has 16 divisors (see below), whose sum is σ = 67127531520. Its totient is φ = 27690105960.

The previous prime is 43423121323. The next prime is 43423121393. The reversal of 43423121331 is 13312132434.

It is a happy number.

43423121331 is a `hidden beast` number, since 4 + 342 + 312 + 1 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 43423121331 - 2³ = 43423121323 is a prime.

It is a super-2 number, since 2×43423121331² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 43423121295 and 43423121304.

It is not an unprimeable number, because it can be changed into a prime (43423122331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34961635 + ... + 34962876.

It is an arithmetic number, because the mean of its divisors is an integer number (4195470720).

Almost surely, 2^43423121331 is an apocalyptic number.

43423121331 is a deficient number, since it is larger than the sum of its proper divisors (23704410189).

43423121331 is a wasteful number, since it uses less digits than its factorization.

43423121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69924543 (or 69924537 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 43423121331 its reverse (13312132434), we get a palindrome (56735253765).

The spelling of 43423121331 in words is "forty-three billion, four hundred twenty-three million, one hundred twenty-one thousand, three hundred thirty-one".