4043120031221 has 2 divisors, whose sum is σ = 4043120031222. Its totient is φ = 4043120031220.

The previous prime is 4043120031187. The next prime is 4043120031257. The reversal of 4043120031221 is 1221300213404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2738647672996 + 1304472358225 = 1654886^2 + 1142135^2 .

It is a cyclic number.

It is not a de Polignac number, because 4043120031221 - 2¹⁴ = 4043120014837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4043120031421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021560015610 + 2021560015611.

It is an arithmetic number, because the mean of its divisors is an integer number (2021560015611).

Almost surely, 2^{4043120031221} is an apocalyptic number.

It is an amenable number.

4043120031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043120031221 is an equidigital number, since it uses as much as digits as its factorization.

4043120031221 is an evil number, because the sum of its binary digits is even.

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

Adding to 4043120031221 its reverse (1221300213404), we get a palindrome (5264420244625).

The spelling of 4043120031221 in words is "four trillion, forty-three billion, one hundred twenty million, thirty-one thousand, two hundred twenty-one".