43001921 has 8 divisors (see below), whose sum is σ = 46120320. Its totient is φ = 39969072.

The previous prime is 43001887. The next prime is 43001923. The reversal of 43001921 is 12910034.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43001921 - 2¹⁰ = 43000897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43001893 and 43001902.

It is not an unprimeable number, because it can be changed into a prime (43001923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20345 + ... + 22358.

It is an arithmetic number, because the mean of its divisors is an integer number (5765040).

Almost surely, 2^43001921 is an apocalyptic number.

It is an amenable number.

43001921 is a deficient number, since it is larger than the sum of its proper divisors (3118399).

43001921 is a wasteful number, since it uses less digits than its factorization.

43001921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42775.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 43001921 is about 6557.5849975429. The cubic root of 43001921 is about 350.3450230367.

Adding to 43001921 its reverse (12910034), we get a palindrome (55911955).

The spelling of 43001921 in words is "forty-three million, one thousand, nine hundred twenty-one".