821234047 has 2 divisors, whose sum is σ = 821234048. Its totient is φ = 821234046.

The previous prime is 821234041. The next prime is 821234053. The reversal of 821234047 is 740432128.

It is a balanced prime because it is at equal distance from previous prime (821234041) and next prime (821234053).

It is a cyclic number.

It is not a de Polignac number, because 821234047 - 2¹⁵ = 821201279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821234041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410617023 + 410617024.

It is an arithmetic number, because the mean of its divisors is an integer number (410617024).

Almost surely, 2^821234047 is an apocalyptic number.

821234047 is a deficient number, since it is larger than the sum of its proper divisors (1).

821234047 is an equidigital number, since it uses as much as digits as its factorization.

821234047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 821234047 is about 28657.1814210679. The cubic root of 821234047 is about 936.4594618701.

The spelling of 821234047 in words is "eight hundred twenty-one million, two hundred thirty-four thousand, forty-seven".