4043220243021 has 12 divisors (see below), whose sum is σ = 5879403039900. Its totient is φ = 2677389690240.

The previous prime is 4043220243019. The next prime is 4043220243089. The reversal of 4043220243021 is 1203420223404.

4043220243021 is a `hidden beast` number, since 4 + 0 + 4 + 3 + 2 + 202 + 430 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1808449385796 + 2234770857225 = 1344786^2 + 1494915^2 .

It is not a de Polignac number, because 4043220243021 - 2¹ = 4043220243019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4043220233021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1507537900 + ... + 1507540581.

It is an arithmetic number, because the mean of its divisors is an integer number (489950253325).

Almost surely, 2^{4043220243021} is an apocalyptic number.

It is an amenable number.

4043220243021 is a deficient number, since it is larger than the sum of its proper divisors (1836182796879).

4043220243021 is a wasteful number, since it uses less digits than its factorization.

4043220243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015078636 (or 3015078633 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 4043220243021 its reverse (1203420223404), we get a palindrome (5246640466425).

The spelling of 4043220243021 in words is "four trillion, forty-three billion, two hundred twenty million, two hundred forty-three thousand, twenty-one".