43211012021 has 4 divisors (see below), whose sum is σ = 43696529100. Its totient is φ = 42725494944.

The previous prime is 43211012017. The next prime is 43211012057. The reversal of 43211012021 is 12021011234.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021011234 = 2 ⋅6010505617.

It can be written as a sum of positive squares in 2 ways, for example, as 25564812100 + 17646199921 = 159890^2 + 132839^2 .

It is a cyclic number.

It is not a de Polignac number, because 43211012021 - 2² = 43211012017 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 (43211012011) 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, 242758406 + ... + 242758583.

It is an arithmetic number, because the mean of its divisors is an integer number (10924132275).

Almost surely, 2^43211012021 is an apocalyptic number.

It is an amenable number.

43211012021 is a deficient number, since it is larger than the sum of its proper divisors (485517079).

43211012021 is an equidigital number, since it uses as much as digits as its factorization.

43211012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485517078.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 43211012021 its reverse (12021011234), we get a palindrome (55232023255).

The spelling of 43211012021 in words is "forty-three billion, two hundred eleven million, twelve thousand, twenty-one".