4215445121 has 2 divisors, whose sum is σ = 4215445122. Its totient is φ = 4215445120.

The previous prime is 4215445111. The next prime is 4215445123. The reversal of 4215445121 is 1215445124.

It is a happy number.

4215445121 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., 3097479025 + 1117966096 = 55655^2 + 33436^2 .

It is a cyclic number.

It is not a de Polignac number, because 4215445121 - 2¹⁰ = 4215444097 is a prime.

Together with 4215445123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4215445123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2107722560 + 2107722561.

It is an arithmetic number, because the mean of its divisors is an integer number (2107722561).

Almost surely, 2^4215445121 is an apocalyptic number.

It is an amenable number.

4215445121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4215445121 is an equidigital number, since it uses as much as digits as its factorization.

4215445121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 29.

The square root of 4215445121 is about 64926.4593289978. The cubic root of 4215445121 is about 1615.4039727221.

The spelling of 4215445121 in words is "four billion, two hundred fifteen million, four hundred forty-five thousand, one hundred twenty-one".