821244 has 12 divisors (see below), whose sum is σ = 1916264. Its totient is φ = 273744.

The previous prime is 821209. The next prime is 821263. The reversal of 821244 is 442128.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 821244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34207 + ... + 34230.

2⁸²¹²⁴⁴ is an apocalyptic number.

It is an amenable number.

821244 is an abundant number, since it is smaller than the sum of its proper divisors (1095020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821244 is a wasteful number, since it uses less digits than its factorization.

821244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68444 (or 68442 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 821244 is about 906.2251375900. The cubic root of 821244 is about 93.6463245015.

It can be divided in two parts, 82124 and 4, that added together give a palindrome (82128).

The spelling of 821244 in words is "eight hundred twenty-one thousand, two hundred forty-four".