4040343121 has 2 divisors, whose sum is σ = 4040343122. Its totient is φ = 4040343120.

The previous prime is 4040343101. The next prime is 4040343149. The reversal of 4040343121 is 1213430404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3450387600 + 589955521 = 58740^2 + 24289^2 .

It is a cyclic number.

It is not a de Polignac number, because 4040343121 - 2¹⁵ = 4040310353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4040343092 and 4040343101.

It is not a weakly prime, because it can be changed into another prime (4040343101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020171560 + 2020171561.

It is an arithmetic number, because the mean of its divisors is an integer number (2020171561).

Almost surely, 2^4040343121 is an apocalyptic number.

It is an amenable number.

4040343121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4040343121 is an equidigital number, since it uses as much as digits as its factorization.

4040343121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 4040343121 is about 63563.6934184917. The cubic root of 4040343121 is about 1592.7199362057.

Adding to 4040343121 its reverse (1213430404), we get a palindrome (5253773525).

The spelling of 4040343121 in words is "four billion, forty million, three hundred forty-three thousand, one hundred twenty-one".