43264021 has 4 divisors (see below), whose sum is σ = 43284844. Its totient is φ = 43243200.

The previous prime is 43263967. The next prime is 43264049. The reversal of 43264021 is 12046234.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35640900 + 7623121 = 5970^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 43264021 - 2¹³ = 43255829 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 43263983 and 43264001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43264421) 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, 6900 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (10821211).

Almost surely, 2^43264021 is an apocalyptic number.

It is an amenable number.

43264021 is a deficient number, since it is larger than the sum of its proper divisors (20823).

43264021 is a wasteful number, since it uses less digits than its factorization.

43264021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20822.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 43264021 is about 6577.5391294921. The cubic root of 43264021 is about 351.0553750130.

The spelling of 43264021 in words is "forty-three million, two hundred sixty-four thousand, twenty-one".