43120121 has 4 divisors (see below), whose sum is σ = 47040144. Its totient is φ = 39200100.

The previous prime is 43120117. The next prime is 43120123. The reversal of 43120121 is 12102134.

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 43120121 - 2² = 43120117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43120096 and 43120105.

It is not an unprimeable number, because it can be changed into a prime (43120123) 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, 1959995 + ... + 1960016.

It is an arithmetic number, because the mean of its divisors is an integer number (11760036).

Almost surely, 2^43120121 is an apocalyptic number.

It is an amenable number.

43120121 is a deficient number, since it is larger than the sum of its proper divisors (3920023).

43120121 is a wasteful number, since it uses less digits than its factorization.

43120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920022.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 43120121 is about 6566.5912770630. The cubic root of 43120121 is about 350.6657288444.

Adding to 43120121 its reverse (12102134), we get a palindrome (55222255).

The spelling of 43120121 in words is "forty-three million, one hundred twenty thousand, one hundred twenty-one".