811822621011 has 16 divisors (see below), whose sum is σ = 1153822963200. Its totient is φ = 506239819488.

The previous prime is 811822621009. The next prime is 811822621021. The reversal of 811822621011 is 110126228118.

It is not a de Polignac number, because 811822621011 - 2¹ = 811822621009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (811822621021) 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, 90137916 + ... + 90146921.

It is an arithmetic number, because the mean of its divisors is an integer number (72113935200).

Almost surely, 2^811822621011 is an apocalyptic number.

811822621011 is a deficient number, since it is larger than the sum of its proper divisors (342000342189).

811822621011 is a wasteful number, since it uses less digits than its factorization.

811822621011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180284938.

The product of its (nonzero) digits is 3072, while the sum is 33.

Adding to 811822621011 its reverse (110126228118), we get a palindrome (921948849129).

The spelling of 811822621011 in words is "eight hundred eleven billion, eight hundred twenty-two million, six hundred twenty-one thousand, eleven".