4140121421 has 2 divisors, whose sum is σ = 4140121422. Its totient is φ = 4140121420.

The previous prime is 4140121397. The next prime is 4140121439. The reversal of 4140121421 is 1241210414.

4140121421 is digitally balanced in base 3, 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., 2658949225 + 1481172196 = 51565^2 + 38486^2 .

It is a cyclic number.

It is not a de Polignac number, because 4140121421 - 2⁶ = 4140121357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4140121393 and 4140121402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4140121481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2070060710 + 2070060711.

It is an arithmetic number, because the mean of its divisors is an integer number (2070060711).

Almost surely, 2^4140121421 is an apocalyptic number.

It is an amenable number.

4140121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4140121421 is an equidigital number, since it uses as much as digits as its factorization.

4140121421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 4140121421 is about 64343.7753088828. The cubic root of 4140121421 is about 1605.7244712849.

Adding to 4140121421 its reverse (1241210414), we get a palindrome (5381331835).

The spelling of 4140121421 in words is "four billion, one hundred forty million, one hundred twenty-one thousand, four hundred twenty-one".