43340443021 has 4 divisors (see below), whose sum is σ = 43342314912. Its totient is φ = 43338571132.

The previous prime is 43340443019. The next prime is 43340443043. The reversal of 43340443021 is 12034404334.

43340443021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43340443021 - 2¹ = 43340443019 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 (43340443051) 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, 900775 + ... + 947668.

It is an arithmetic number, because the mean of its divisors is an integer number (10835578728).

Almost surely, 2^43340443021 is an apocalyptic number.

It is an amenable number.

43340443021 is a deficient number, since it is larger than the sum of its proper divisors (1871891).

43340443021 is a wasteful number, since it uses less digits than its factorization.

43340443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871890.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 43340443021 its reverse (12034404334), we get a palindrome (55374847355).

The spelling of 43340443021 in words is "forty-three billion, three hundred forty million, four hundred forty-three thousand, twenty-one".