43146021 has 4 divisors (see below), whose sum is σ = 57528032. Its totient is φ = 28764012.

The previous prime is 43146001. The next prime is 43146023. The reversal of 43146021 is 12064134.

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 43146021 - 2¹¹ = 43143973 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 (43146023) 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, 7191001 + ... + 7191006.

It is an arithmetic number, because the mean of its divisors is an integer number (14382008).

Almost surely, 2^43146021 is an apocalyptic number.

It is an amenable number.

43146021 is a deficient number, since it is larger than the sum of its proper divisors (14382011).

43146021 is a wasteful number, since it uses less digits than its factorization.

43146021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14382010.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 43146021 is about 6568.5630848763. The cubic root of 43146021 is about 350.7359236426.

The spelling of 43146021 in words is "forty-three million, one hundred forty-six thousand, twenty-one".