821612911 has 16 divisors (see below), whose sum is σ = 968433664. Its totient is φ = 682413984.

The previous prime is 821612851. The next prime is 821612917. The reversal of 821612911 is 119216128.

It is a happy number.

It is not a de Polignac number, because 821612911 - 2²³ = 813224303 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 (821612917) 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 15 ways as a sum of consecutive naturals, for example, 27481 + ... + 48973.

It is an arithmetic number, because the mean of its divisors is an integer number (60527104).

Almost surely, 2^821612911 is an apocalyptic number.

821612911 is a deficient number, since it is larger than the sum of its proper divisors (146820753).

821612911 is a wasteful number, since it uses less digits than its factorization.

821612911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21670.

The product of its digits is 1728, while the sum is 31.

The square root of 821612911 is about 28663.7909390925. The cubic root of 821612911 is about 936.6034469024.

The spelling of 821612911 in words is "eight hundred twenty-one million, six hundred twelve thousand, nine hundred eleven".