81101010111 has 16 divisors (see below), whose sum is σ = 117970942080. Its totient is φ = 49149695520.

The previous prime is 81101010103. The next prime is 81101010121. The reversal of 81101010111 is 11101010118.

It is not a de Polignac number, because 81101010111 - 2³ = 81101010103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81101010121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796905 + ... + 892893.

It is an arithmetic number, because the mean of its divisors is an integer number (7373183880).

Almost surely, 2^81101010111 is an apocalyptic number.

81101010111 is a deficient number, since it is larger than the sum of its proper divisors (36869931969).

81101010111 is a wasteful number, since it uses less digits than its factorization.

81101010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121606.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 81101010111 its reverse (11101010118), we get a palindrome (92202020229).

It can be divided in two parts, 811010 and 10111, that added together give a triangular number (821121 = T₁₂₈₁).

The spelling of 81101010111 in words is "eighty-one billion, one hundred one million, ten thousand, one hundred eleven".