43211234021 has 4 divisors (see below), whose sum is σ = 43228309344. Its totient is φ = 43194158700.

The previous prime is 43211233973. The next prime is 43211234029. The reversal of 43211234021 is 12043211234.

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 a de Polignac number, because none of the positive numbers 2^k-43211234021 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 (43211234029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8533865 + ... + 8538926.

It is an arithmetic number, because the mean of its divisors is an integer number (10807077336).

Almost surely, 2^43211234021 is an apocalyptic number.

It is an amenable number.

43211234021 is a deficient number, since it is larger than the sum of its proper divisors (17075323).

43211234021 is a wasteful number, since it uses less digits than its factorization.

43211234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17075322.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 43211234021 its reverse (12043211234), we get a palindrome (55254445255).

The spelling of 43211234021 in words is "forty-three billion, two hundred eleven million, two hundred thirty-four thousand, twenty-one".