821012 has 6 divisors (see below), whose sum is σ = 1436778. Its totient is φ = 410504.

The previous prime is 821003. The next prime is 821027. The reversal of 821012 is 210128.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 234256 = 766^2 + 484^2 .

It is a congruent number.

It is an unprimeable number.

821012 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102623 + ... + 102630.

It is an arithmetic number, because the mean of its divisors is an integer number (239463).

2⁸²¹⁰¹² is an apocalyptic number.

It is an amenable number.

821012 is a deficient number, since it is larger than the sum of its proper divisors (615766).

821012 is a wasteful number, since it uses less digits than its factorization.

821012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205257 (or 205255 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 821012 is about 906.0971250368. The cubic root of 821012 is about 93.6375053632.

The spelling of 821012 in words is "eight hundred twenty-one thousand, twelve".