43442121 has 4 divisors (see below), whose sum is σ = 57922832. Its totient is φ = 28961412.

The previous prime is 43442111. The next prime is 43442137. The reversal of 43442121 is 12124434.

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.

It is not a de Polignac number, because 43442121 - 2¹¹ = 43440073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43442111) 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, 7240351 + ... + 7240356.

It is an arithmetic number, because the mean of its divisors is an integer number (14480708).

Almost surely, 2^43442121 is an apocalyptic number.

It is an amenable number.

43442121 is a deficient number, since it is larger than the sum of its proper divisors (14480711).

43442121 is a wasteful number, since it uses less digits than its factorization.

43442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14480710.

The product of its digits is 768, while the sum is 21.

The square root of 43442121 is about 6591.0637229509. The cubic root of 43442121 is about 351.5364318884.

Adding to 43442121 its reverse (12124434), we get a palindrome (55566555).

The spelling of 43442121 in words is "forty-three million, four hundred forty-two thousand, one hundred twenty-one".