111211100001 has 12 divisors (see below), whose sum is σ = 161702087040. Its totient is φ = 73649734200.

The previous prime is 111211099957. The next prime is 111211100023. The reversal of 111211100001 is 100001112111.

It is not a de Polignac number, because 111211100001 - 2⁷ = 111211099873 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 not an unprimeable number, because it can be changed into a prime (111211100081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40915161 + ... + 40917878.

It is an arithmetic number, because the mean of its divisors is an integer number (13475173920).

Almost surely, 2^111211100001 is an apocalyptic number.

It is an amenable number.

111211100001 is a deficient number, since it is larger than the sum of its proper divisors (50490987039).

111211100001 is a wasteful number, since it uses less digits than its factorization.

111211100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81833196 (or 81833193 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111211100001 its reverse (100001112111), we get a palindrome (211212212112).

The spelling of 111211100001 in words is "one hundred eleven billion, two hundred eleven million, one hundred thousand, one".