42521117 has 2 divisors, whose sum is σ = 42521118. Its totient is φ = 42521116.

The previous prime is 42521111. The next prime is 42521153. The reversal of 42521117 is 71112524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24492601 + 18028516 = 4949^2 + 4246^2 .

It is a cyclic number.

It is not a de Polignac number, because 42521117 - 2¹² = 42517021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42521092 and 42521101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42521111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260558 + 21260559.

It is an arithmetic number, because the mean of its divisors is an integer number (21260559).

Almost surely, 2^42521117 is an apocalyptic number.

It is an amenable number.

42521117 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521117 is an equidigital number, since it uses as much as digits as its factorization.

42521117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560, while the sum is 23.

The square root of 42521117 is about 6520.8218040367. The cubic root of 42521117 is about 349.0343915118.

The spelling of 42521117 in words is "forty-two million, five hundred twenty-one thousand, one hundred seventeen".