40006121 has 2 divisors, whose sum is σ = 40006122. Its totient is φ = 40006120.

The previous prime is 40006111. The next prime is 40006129. The reversal of 40006121 is 12160004.

40006121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24364096 + 15642025 = 4936^2 + 3955^2 .

It is a cyclic number.

It is not a de Polignac number, because 40006121 - 2²² = 35811817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40006096 and 40006105.

It is not a weakly prime, because it can be changed into another prime (40006129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20003060 + 20003061.

It is an arithmetic number, because the mean of its divisors is an integer number (20003061).

Almost surely, 2^40006121 is an apocalyptic number.

It is an amenable number.

40006121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40006121 is an equidigital number, since it uses as much as digits as its factorization.

40006121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 40006121 is about 6325.0392093646. The cubic root of 40006121 is about 342.0126330502.

Adding to 40006121 its reverse (12160004), we get a palindrome (52166125).

The spelling of 40006121 in words is "forty million, six thousand, one hundred twenty-one".