43001021 has 4 divisors (see below), whose sum is σ = 49144032. Its totient is φ = 36858012.

The previous prime is 43001011. The next prime is 43001027. The reversal of 43001021 is 12010034.

It is a happy number.

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 43001021 - 2¹⁸ = 42738877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43000993 and 43001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071495 + ... + 3071508.

It is an arithmetic number, because the mean of its divisors is an integer number (12286008).

Almost surely, 2^43001021 is an apocalyptic number.

It is an amenable number.

43001021 is a deficient number, since it is larger than the sum of its proper divisors (6143011).

43001021 is an equidigital number, since it uses as much as digits as its factorization.

43001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143010.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 43001021 is about 6557.5163743600. The cubic root of 43001021 is about 350.3425788612.

Adding to 43001021 its reverse (12010034), we get a palindrome (55011055).

The spelling of 43001021 in words is "forty-three million, one thousand, twenty-one".