10111111212111 has 32 divisors (see below), whose sum is σ = 17041041228288. Its totient is φ = 5189189235840.

The previous prime is 10111111212089. The next prime is 10111111212127. The reversal of 10111111212111 is 11121211111101.

It is a happy number.

It is not a de Polignac number, because 10111111212111 - 2⁶ = 10111111212047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111111212131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500490405 + ... + 500510606.

It is an arithmetic number, because the mean of its divisors is an integer number (532532538384).

Almost surely, 2^{10111111212111} is an apocalyptic number.

10111111212111 is a deficient number, since it is larger than the sum of its proper divisors (6929930016177).

10111111212111 is a wasteful number, since it uses less digits than its factorization.

10111111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001001071.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 10111111212111 its reverse (11121211111101), we get a palindrome (21232322323212).

It can be divided in two parts, 1011111 and 1212111, that added together give a palindrome (2223222).

The spelling of 10111111212111 in words is "ten trillion, one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".