842047521 has 32 divisors (see below), whose sum is σ = 1301142528. Its totient is φ = 474456000.

The previous prime is 842047511. The next prime is 842047523. The reversal of 842047521 is 125740248.

It is not a de Polignac number, because 842047521 - 2⁵ = 842047489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (842047523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 563251 + ... + 564743.

It is an arithmetic number, because the mean of its divisors is an integer number (40660704).

Almost surely, 2^842047521 is an apocalyptic number.

It is an amenable number.

842047521 is a deficient number, since it is larger than the sum of its proper divisors (459095007).

842047521 is a wasteful number, since it uses less digits than its factorization.

842047521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 842047521 is about 29018.0550864457. The cubic root of 842047521 is about 944.3048071443.

Adding to 842047521 its reverse (125740248), we get a palindrome (967787769).

The spelling of 842047521 in words is "eight hundred forty-two million, forty-seven thousand, five hundred twenty-one".