43433121321 has 16 divisors (see below), whose sum is σ = 64740128320. Its totient is φ = 28777770720.

The previous prime is 43433121293. The next prime is 43433121323. The reversal of 43433121321 is 12312133434.

It is a happy number.

43433121321 is a `hidden beast` number, since 4 + 3 + 4 + 331 + 2 + 1 + 321 = 666.

It is not a de Polignac number, because 43433121321 - 2⁶ = 43433121257 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43433121323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4930060 + ... + 4938861.

It is an arithmetic number, because the mean of its divisors is an integer number (4046258020).

Almost surely, 2^43433121321 is an apocalyptic number.

It is an amenable number.

43433121321 is a deficient number, since it is larger than the sum of its proper divisors (21307006999).

43433121321 is a wasteful number, since it uses less digits than its factorization.

43433121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9869093 (or 9869087 counting only the distinct ones).

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

Adding to 43433121321 its reverse (12312133434), we get a palindrome (55745254755).

The spelling of 43433121321 in words is "forty-three billion, four hundred thirty-three million, one hundred twenty-one thousand, three hundred twenty-one".