821234123 has 2 divisors, whose sum is σ = 821234124. Its totient is φ = 821234122.

The previous prime is 821234111. The next prime is 821234137. The reversal of 821234123 is 321432128.

821234123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821234123 - 2¹⁴ = 821217739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821234092 and 821234101.

It is not a weakly prime, because it can be changed into another prime (821234723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410617061 + 410617062.

It is an arithmetic number, because the mean of its divisors is an integer number (410617062).

Almost surely, 2^821234123 is an apocalyptic number.

821234123 is a deficient number, since it is larger than the sum of its proper divisors (1).

821234123 is an equidigital number, since it uses as much as digits as its factorization.

821234123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 821234123 is about 28657.1827470880. The cubic root of 821234123 is about 936.4594907579.

The spelling of 821234123 in words is "eight hundred twenty-one million, two hundred thirty-four thousand, one hundred twenty-three".