42821210 has 16 divisors (see below), whose sum is σ = 79162056. Its totient is φ = 16665408.

The previous prime is 42821203. The next prime is 42821221. The reversal of 42821210 is 1212824.

It is a happy number.

42821210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 31685641 + 11135569 = 5629^2 + 3337^2 .

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 57497 + ... + 58236.

Almost surely, 2^42821210 is an apocalyptic number.

42821210 is a deficient number, since it is larger than the sum of its proper divisors (36340846).

42821210 is a wasteful number, since it uses less digits than its factorization.

42821210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115777.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 42821210 is about 6543.7917142892. The cubic root of 42821210 is about 349.8535714006.

The spelling of 42821210 in words is "forty-two million, eight hundred twenty-one thousand, two hundred ten".