821213814 has 16 divisors (see below), whose sum is σ = 1649665728. Its totient is φ = 272531592.

The previous prime is 821213797. The next prime is 821213819. The reversal of 821213814 is 418312128.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821213819) 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 in 7 ways as a sum of consecutive naturals, for example, 300112 + ... + 302835.

It is an arithmetic number, because the mean of its divisors is an integer number (103104108).

Almost surely, 2^821213814 is an apocalyptic number.

821213814 is an abundant number, since it is smaller than the sum of its proper divisors (828451914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821213814 is a wasteful number, since it uses less digits than its factorization.

821213814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603179.

The product of its digits is 3072, while the sum is 30.

The square root of 821213814 is about 28656.8284009239. The cubic root of 821213814 is about 936.4517711921.

The spelling of 821213814 in words is "eight hundred twenty-one million, two hundred thirteen thousand, eight hundred fourteen".