821052081 has 24 divisors (see below), whose sum is σ = 1232391680. Its totient is φ = 526176000.

The previous prime is 821052053. The next prime is 821052109. The reversal of 821052081 is 180250128.

It is an interprime number because it is at equal distance from previous prime (821052053) and next prime (821052109).

It is not a de Polignac number, because 821052081 - 2⁶ = 821052017 is a prime.

It is a super-2 number, since 2×821052081² = 1348253039428861122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821052581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32385 + ... + 51873.

Almost surely, 2^821052081 is an apocalyptic number.

It is an amenable number.

821052081 is a deficient number, since it is larger than the sum of its proper divisors (411339599).

821052081 is a wasteful number, since it uses less digits than its factorization.

821052081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19677 (or 19674 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 821052081 is about 28654.0063690926. The cubic root of 821052081 is about 936.3902910207.

The spelling of 821052081 in words is "eight hundred twenty-one million, fifty-two thousand, eighty-one".