43020121 has 4 divisors (see below), whose sum is σ = 43083792. Its totient is φ = 42956452.

The previous prime is 43020077. The next prime is 43020127. The reversal of 43020121 is 12102034.

43020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43020121 - 2¹³ = 43011929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43020127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30811 + ... + 32176.

It is an arithmetic number, because the mean of its divisors is an integer number (10770948).

Almost surely, 2^43020121 is an apocalyptic number.

It is an amenable number.

43020121 is a deficient number, since it is larger than the sum of its proper divisors (63671).

43020121 is an equidigital number, since it uses as much as digits as its factorization.

43020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63670.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 43020121 is about 6558.9725567348. The cubic root of 43020121 is about 350.3944423799.

Adding to 43020121 its reverse (12102034), we get a palindrome (55122155).

The spelling of 43020121 in words is "forty-three million, twenty thousand, one hundred twenty-one".