43121121 has 4 divisors (see below), whose sum is σ = 57494832. Its totient is φ = 28747412.

The previous prime is 43121101. The next prime is 43121189. The reversal of 43121121 is 12112134.

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 a cyclic number.

It is not a de Polignac number, because 43121121 - 2¹⁰ = 43120097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43121121.

It is not an unprimeable number, because it can be changed into a prime (43121101) 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, 7186851 + ... + 7186856.

It is an arithmetic number, because the mean of its divisors is an integer number (14373708).

Almost surely, 2^43121121 is an apocalyptic number.

It is an amenable number.

43121121 is a deficient number, since it is larger than the sum of its proper divisors (14373711).

43121121 is a wasteful number, since it uses less digits than its factorization.

43121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14373710.

The product of its digits is 48, while the sum is 15.

The square root of 43121121 is about 6566.6674196277. The cubic root of 43121121 is about 350.6684395899.

Adding to 43121121 its reverse (12112134), we get a palindrome (55233255).

The spelling of 43121121 in words is "forty-three million, one hundred twenty-one thousand, one hundred twenty-one".