43204921 has 4 divisors (see below), whose sum is σ = 43241472. Its totient is φ = 43168372.

The previous prime is 43204919. The next prime is 43204927. The reversal of 43204921 is 12940234.

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 43204921 - 2¹ = 43204919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43204927) 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, 16441 + ... + 18886.

It is an arithmetic number, because the mean of its divisors is an integer number (10810368).

Almost surely, 2^43204921 is an apocalyptic number.

It is an amenable number.

43204921 is a deficient number, since it is larger than the sum of its proper divisors (36551).

43204921 is a wasteful number, since it uses less digits than its factorization.

43204921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36550.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 43204921 is about 6573.0450325553. The cubic root of 43204921 is about 350.8954513124.

The spelling of 43204921 in words is "forty-three million, two hundred four thousand, nine hundred twenty-one".