821043316 has 12 divisors (see below), whose sum is σ = 1448140288. Its totient is φ = 407288952.

The previous prime is 821043313. The next prime is 821043317. The reversal of 821043316 is 613340128.

It is a super-2 number, since 2×821043316² = 1348224253496551712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821043313) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 807606 + ... + 808621.

Almost surely, 2^821043316 is an apocalyptic number.

It is an amenable number.

821043316 is a deficient number, since it is larger than the sum of its proper divisors (627096972).

821043316 is a wasteful number, since it uses less digits than its factorization.

821043316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616358 (or 1616356 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 821043316 is about 28653.8534232309. The cubic root of 821043316 is about 936.3869589177.

The spelling of 821043316 in words is "eight hundred twenty-one million, forty-three thousand, three hundred sixteen".