43443013121 has 4 divisors (see below), whose sum is σ = 43443850032. Its totient is φ = 43442176212.

The previous prime is 43443013109. The next prime is 43443013169. The reversal of 43443013121 is 12131034434.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12131034434 = 2 ⋅6065517217.

It is a cyclic number.

It is not a de Polignac number, because 43443013121 - 2¹⁸ = 43442750977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43443013021) 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, 335051 + ... + 446256.

It is an arithmetic number, because the mean of its divisors is an integer number (10860962508).

Almost surely, 2^43443013121 is an apocalyptic number.

It is an amenable number.

43443013121 is a deficient number, since it is larger than the sum of its proper divisors (836911).

43443013121 is an equidigital number, since it uses as much as digits as its factorization.

43443013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836910.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 43443013121 its reverse (12131034434), we get a palindrome (55574047555).

The spelling of 43443013121 in words is "forty-three billion, four hundred forty-three million, thirteen thousand, one hundred twenty-one".