42445452121 has 2 divisors, whose sum is σ = 42445452122. Its totient is φ = 42445452120.

The previous prime is 42445452113. The next prime is 42445452187. The reversal of 42445452121 is 12125454424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39376846096 + 3068606025 = 198436^2 + 55395^2 .

It is a cyclic number.

It is not a de Polignac number, because 42445452121 - 2³ = 42445452113 is a prime.

It is a super-2 number, since 2×42445452121² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42445452421) 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, 21222726060 + 21222726061.

It is an arithmetic number, because the mean of its divisors is an integer number (21222726061).

Almost surely, 2^42445452121 is an apocalyptic number.

It is an amenable number.

42445452121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42445452121 is an equidigital number, since it uses as much as digits as its factorization.

42445452121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51200, while the sum is 34.

The spelling of 42445452121 in words is "forty-two billion, four hundred forty-five million, four hundred fifty-two thousand, one hundred twenty-one".