821229 has 8 divisors (see below), whose sum is σ = 1099200. Its totient is φ = 545376.

The previous prime is 821209. The next prime is 821263. The reversal of 821229 is 922128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 821229 - 2⁷ = 821101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821199 and 821208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072 + ... + 1670.

It is an arithmetic number, because the mean of its divisors is an integer number (137400).

2⁸²¹²²⁹ is an apocalyptic number.

It is an amenable number.

821229 is a deficient number, since it is larger than the sum of its proper divisors (277971).

821229 is a wasteful number, since it uses less digits than its factorization.

821229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059.

The product of its digits is 576, while the sum is 24.

The square root of 821229 is about 906.2168614631. The cubic root of 821229 is about 93.6457543489.

The spelling of 821229 in words is "eight hundred twenty-one thousand, two hundred twenty-nine".