111011120021221 has 16 divisors (see below), whose sum is σ = 127154629008000. Its totient is φ = 94938812817408.

The previous prime is 111011120021213. The next prime is 111011120021237. The reversal of 111011120021221 is 122120021110111.

It is not a de Polignac number, because 111011120021221 - 2³ = 111011120021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111011120021195 and 111011120021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111011120021821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200935861 + ... + 201487573.

It is an arithmetic number, because the mean of its divisors is an integer number (7947164313000).

Almost surely, 2^{111011120021221} is an apocalyptic number.

It is an amenable number.

111011120021221 is a deficient number, since it is larger than the sum of its proper divisors (16143508986779).

111011120021221 is an equidigital number, since it uses as much as digits as its factorization.

111011120021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616188.

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

Adding to 111011120021221 its reverse (122120021110111), we get a palindrome (233131141131332).

The spelling of 111011120021221 in words is "one hundred eleven trillion, eleven billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".