43106021 has 4 divisors (see below), whose sum is σ = 49264032. Its totient is φ = 36948012.

The previous prime is 43105973. The next prime is 43106023. The reversal of 43106021 is 12060134.

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 43106021 - 2⁶ = 43105957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43106023) 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, 3078995 + ... + 3079008.

It is an arithmetic number, because the mean of its divisors is an integer number (12316008).

Almost surely, 2^43106021 is an apocalyptic number.

It is an amenable number.

43106021 is a deficient number, since it is larger than the sum of its proper divisors (6158011).

43106021 is an equidigital number, since it uses as much as digits as its factorization.

43106021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158010.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 43106021 is about 6565.5175728955. The cubic root of 43106021 is about 350.6275028709.

Adding to 43106021 its reverse (12060134), we get a palindrome (55166155).

The spelling of 43106021 in words is "forty-three million, one hundred six thousand, twenty-one".