111121220111 has 24 divisors (see below), whose sum is σ = 128876521200. Its totient is φ = 95474332800.

The previous prime is 111121220107. The next prime is 111121220129. The reversal of 111121220111 is 111022121111.

It is not a de Polignac number, because 111121220111 - 2² = 111121220107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121220311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 910475 + ... + 1025283.

It is an arithmetic number, because the mean of its divisors is an integer number (5369855050).

Almost surely, 2^111121220111 is an apocalyptic number.

111121220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111121220111 is a deficient number, since it is larger than the sum of its proper divisors (17755301089).

111121220111 is a wasteful number, since it uses less digits than its factorization.

111121220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115271 (or 115260 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111121220111 its reverse (111022121111), we get a palindrome (222143341222).

The spelling of 111121220111 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eleven".