111221211212111 has 128 divisors (see below), whose sum is σ = 152713628024832. Its totient is φ = 78208752960000.

The previous prime is 111221211212053. The next prime is 111221211212119. The reversal of 111221211212111 is 111212112122111.

It is not a de Polignac number, because 111221211212111 - 2¹⁰ = 111221211211087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221211212119) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 24225920426 + ... + 24225925016.

It is an arithmetic number, because the mean of its divisors is an integer number (1193075218944).

Almost surely, 2^{111221211212111} is an apocalyptic number.

111221211212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111221211212111 is a deficient number, since it is larger than the sum of its proper divisors (41492416812721).

111221211212111 is a wasteful number, since it uses less digits than its factorization.

111221211212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693.

The product of its digits is 32, while the sum is 20.

Adding to 111221211212111 its reverse (111212112122111), we get a palindrome (222433323334222).

The spelling of 111221211212111 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".