42821125 has 8 divisors (see below), whose sum is σ = 53440920. Its totient is φ = 34256800.

The previous prime is 42821087. The next prime is 42821159. The reversal of 42821125 is 52112824.

It can be written as a sum of positive squares in 4 ways, for example, as 401956 + 42419169 = 634^2 + 6513^2 .

It is not a de Polignac number, because 42821125 - 2¹⁵ = 42788357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 42821125.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 171160 + ... + 171409.

It is an arithmetic number, because the mean of its divisors is an integer number (6680115).

Almost surely, 2^42821125 is an apocalyptic number.

It is an amenable number.

42821125 is a deficient number, since it is larger than the sum of its proper divisors (10619795).

42821125 is an equidigital number, since it uses as much as digits as its factorization.

42821125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342584 (or 342574 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 42821125 is about 6543.7852195805. The cubic root of 42821125 is about 349.8533399143.

Adding to 42821125 its reverse (52112824), we get a palindrome (94933949).

The spelling of 42821125 in words is "forty-two million, eight hundred twenty-one thousand, one hundred twenty-five".