821123 has 8 divisors (see below), whose sum is σ = 902400. Its totient is φ = 743688.

The previous prime is 821113. The next prime is 821131. The reversal of 821123 is 321128.

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

It is a cyclic number.

It is not a de Polignac number, because 821123 - 2¹² = 817027 is a prime.

It is a super-2 number, since 2×821123² = 1348485962258, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (821113) 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, 503 + ... + 1376.

It is an arithmetic number, because the mean of its divisors is an integer number (112800).

2⁸²¹¹²³ is an apocalyptic number.

821123 is a deficient number, since it is larger than the sum of its proper divisors (81277).

821123 is a wasteful number, since it uses less digits than its factorization.

821123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its digits is 96, while the sum is 17.

The square root of 821123 is about 906.1583746785. The cubic root of 821123 is about 93.6417250720.

The spelling of 821123 in words is "eight hundred twenty-one thousand, one hundred twenty-three".