821057283 has 16 divisors (see below), whose sum is σ = 1221611040. Its totient is φ = 545018112.

The previous prime is 821057273. The next prime is 821057297. The reversal of 821057283 is 382750128.

821057283 is a `hidden beast` number, since 8 + 2 + 1 + 0 + 572 + 83 = 666.

It is not a de Polignac number, because 821057283 - 2¹² = 821053187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821057273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58966 + ... + 71547.

It is an arithmetic number, because the mean of its divisors is an integer number (76350690).

Almost surely, 2^821057283 is an apocalyptic number.

821057283 is a deficient number, since it is larger than the sum of its proper divisors (400553757).

821057283 is a wasteful number, since it uses less digits than its factorization.

821057283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130755 (or 130749 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 821057283 is about 28654.0971415957. The cubic root of 821057283 is about 936.3922686021.

The spelling of 821057283 in words is "eight hundred twenty-one million, fifty-seven thousand, two hundred eighty-three".