821210086 has 4 divisors (see below), whose sum is σ = 1231815132. Its totient is φ = 410605042.

The previous prime is 821210083. The next prime is 821210111. The reversal of 821210086 is 680012128.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821210083) 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, 205302520 + ... + 205302523.

It is an arithmetic number, because the mean of its divisors is an integer number (307953783).

Almost surely, 2^821210086 is an apocalyptic number.

821210086 is a deficient number, since it is larger than the sum of its proper divisors (410605046).

821210086 is a wasteful number, since it uses less digits than its factorization.

821210086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410605045.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 821210086 is about 28656.7633552710. The cubic root of 821210086 is about 936.4503541443.

The spelling of 821210086 in words is "eight hundred twenty-one million, two hundred ten thousand, eighty-six".