821223283 has 4 divisors (see below), whose sum is σ = 823425328. Its totient is φ = 819021240.

The previous prime is 821223253. The next prime is 821223307. The reversal of 821223283 is 382322128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 821223283 - 2²⁹ = 284352371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821223253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100463 + ... + 1101208.

It is an arithmetic number, because the mean of its divisors is an integer number (205856332).

Almost surely, 2^821223283 is an apocalyptic number.

821223283 is a deficient number, since it is larger than the sum of its proper divisors (2202045).

821223283 is a wasteful number, since it uses less digits than its factorization.

821223283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202044.

The product of its digits is 9216, while the sum is 31.

The square root of 821223283 is about 28656.9936141250. The cubic root of 821223283 is about 936.4553704284.

The spelling of 821223283 in words is "eight hundred twenty-one million, two hundred twenty-three thousand, two hundred eighty-three".