821444042 has 8 divisors (see below), whose sum is σ = 1239725856. Its totient is φ = 408202092.

The previous prime is 821444033. The next prime is 821444047. The reversal of 821444042 is 240444128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 821443996 and 821444014.

It is not an unprimeable number, because it can be changed into a prime (821444047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259558 + ... + 1260209.

It is an arithmetic number, because the mean of its divisors is an integer number (154965732).

Almost surely, 2^821444042 is an apocalyptic number.

821444042 is a deficient number, since it is larger than the sum of its proper divisors (418281814).

821444042 is a wasteful number, since it uses less digits than its factorization.

821444042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519932.

The product of its (nonzero) digits is 8192, while the sum is 29.

The square root of 821444042 is about 28660.8451026832. The cubic root of 821444042 is about 936.5392747022.

The spelling of 821444042 in words is "eight hundred twenty-one million, four hundred forty-four thousand, forty-two".