111111010101 has 96 divisors (see below), whose sum is σ = 203159989760. Its totient is φ = 56942341632.

The previous prime is 111111010093. The next prime is 111111010103. The reversal of 111111010101 is 101010111111.

It is not a de Polignac number, because 111111010101 - 2³ = 111111010093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111010103) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25118976 + ... + 25123398.

Almost surely, 2^111111010101 is an apocalyptic number.

It is an amenable number.

111111010101 is a deficient number, since it is larger than the sum of its proper divisors (92048979659).

111111010101 is a wasteful number, since it uses less digits than its factorization.

111111010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315 (or 5312 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 111111010101 its reverse (101010111111), we get a palindrome (212121121212).

It can be divided in two parts, 111111010 and 101, that added together give a palindrome (111111111).

The spelling of 111111010101 in words is "one hundred eleven billion, one hundred eleven million, ten thousand, one hundred one".