821323143 has 12 divisors (see below), whose sum is σ = 1188127200. Its totient is φ = 546731136.

The previous prime is 821323117. The next prime is 821323147. The reversal of 821323143 is 341323128.

821323143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 821323143 - 2¹² = 821319047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821323147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61743 + ... + 73856.

It is an arithmetic number, because the mean of its divisors is an integer number (99010600).

Almost surely, 2^821323143 is an apocalyptic number.

821323143 is a deficient number, since it is larger than the sum of its proper divisors (366804057).

821323143 is a wasteful number, since it uses less digits than its factorization.

821323143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136278 (or 136275 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 821323143 is about 28658.7358932665. The cubic root of 821323143 is about 936.4933262621.

The spelling of 821323143 in words is "eight hundred twenty-one million, three hundred twenty-three thousand, one hundred forty-three".