111121021221111 has 48 divisors (see below), whose sum is σ = 179375512811040. Its totient is φ = 65701656576000.

The previous prime is 111121021221061. The next prime is 111121021221179. The reversal of 111121021221111 is 111122120121111.

111121021221111 is a `hidden beast` number, since 1 + 111 + 210 + 212 + 21 + 111 = 666.

It is not a de Polignac number, because 111121021221111 - 2⁷ = 111121021220983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121021221011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152990775 + ... + 153715383.

It is an arithmetic number, because the mean of its divisors is an integer number (3736989850230).

Almost surely, 2^{111121021221111} is an apocalyptic number.

111121021221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111121021221111 is a deficient number, since it is larger than the sum of its proper divisors (68254491589929).

111121021221111 is a wasteful number, since it uses less digits than its factorization.

111121021221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762448 (or 762445 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111121021221111 its reverse (111122120121111), we get a palindrome (222243141342222).

The spelling of 111121021221111 in words is "one hundred eleven trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred eleven".