42821171 has 2 divisors, whose sum is σ = 42821172. Its totient is φ = 42821170.

The previous prime is 42821167. The next prime is 42821189. The reversal of 42821171 is 17112824.

42821171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42821171 - 2² = 42821167 is a prime.

It is a super-2 number, since 2×42821171² = 3667305371622482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42821171.

It is not a weakly prime, because it can be changed into another prime (42841171) 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, 21410585 + 21410586.

It is an arithmetic number, because the mean of its divisors is an integer number (21410586).

Almost surely, 2^42821171 is an apocalyptic number.

42821171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42821171 is an equidigital number, since it uses as much as digits as its factorization.

42821171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 26.

The square root of 42821171 is about 6543.7887343648. The cubic root of 42821171 is about 349.8534651893.

Adding to 42821171 its reverse (17112824), we get a palindrome (59933995).

The spelling of 42821171 in words is "forty-two million, eight hundred twenty-one thousand, one hundred seventy-one".