111111111210001 has 32 divisors (see below), whose sum is σ = 138036456529920. Its totient is φ = 87278928710400.

The previous prime is 111111111209977. The next prime is 111111111210007. The reversal of 111111111210001 is 100012111111111.

It is not a de Polignac number, because 111111111210001 - 2²¹ = 111111109112849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111111111210007) 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 31 ways as a sum of consecutive naturals, for example, 4390386 + ... + 15540196.

It is an arithmetic number, because the mean of its divisors is an integer number (4313639266560).

Almost surely, 2^{111111111210001} is an apocalyptic number.

It is an amenable number.

111111111210001 is a deficient number, since it is larger than the sum of its proper divisors (26925345319919).

111111111210001 is a wasteful number, since it uses less digits than its factorization.

111111111210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11152285.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 111111111210001 its reverse (100012111111111), we get a palindrome (211123222321112).

The spelling of 111111111210001 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred ten thousand, one".