111221110220121 has 32 divisors (see below), whose sum is σ = 179753190906240. Its totient is φ = 67406020344000.

The previous prime is 111221110220117. The next prime is 111221110220123. The reversal of 111221110220121 is 121022011122111.

It is a happy number.

111221110220121 is a `hidden beast` number, since 1 + 112 + 211 + 1 + 0 + 220 + 121 = 666.

It is not a de Polignac number, because 111221110220121 - 2² = 111221110220117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111221110220094 and 111221110220103.

It is not an unprimeable number, because it can be changed into a prime (111221110220123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26844771 + ... + 30709671.

It is an arithmetic number, because the mean of its divisors is an integer number (5617287215820).

Almost surely, 2^{111221110220121} is an apocalyptic number.

111221110220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111221110220121 is a deficient number, since it is larger than the sum of its proper divisors (68532080686119).

111221110220121 is a wasteful number, since it uses less digits than its factorization.

111221110220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961814 (or 3961808 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111221110220121 its reverse (121022011122111), we get a palindrome (232243121342232).

The spelling of 111221110220121 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred ten million, two hundred twenty thousand, one hundred twenty-one".