821068421 has 16 divisors (see below), whose sum is σ = 875111040. Its totient is φ = 768630720.

The previous prime is 821068411. The next prime is 821068429. The reversal of 821068421 is 124860128.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 821068421 - 2¹⁸ = 820806277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821068429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805250 + ... + 806268.

It is an arithmetic number, because the mean of its divisors is an integer number (54694440).

Almost surely, 2^821068421 is an apocalyptic number.

It is an amenable number.

821068421 is a deficient number, since it is larger than the sum of its proper divisors (54042619).

821068421 is a wasteful number, since it uses less digits than its factorization.

821068421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 821068421 is about 28654.2914935966. The cubic root of 821068421 is about 936.3965027727.

The spelling of 821068421 in words is "eight hundred twenty-one million, sixty-eight thousand, four hundred twenty-one".