111221100212021 has 4 divisors (see below), whose sum is σ = 111835581428844. Its totient is φ = 110606618995200.

The previous prime is 111221100211967. The next prime is 111221100212069. The reversal of 111221100212021 is 120212001122111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54512218131121 + 56708882080900 = 7383239^2 + 7530530^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221100212021 - 2¹⁴ = 111221100195637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221100218021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307240608140 + ... + 307240608501.

It is an arithmetic number, because the mean of its divisors is an integer number (27958895357211).

Almost surely, 2^{111221100212021} is an apocalyptic number.

It is an amenable number.

111221100212021 is a deficient number, since it is larger than the sum of its proper divisors (614481216823).

111221100212021 is an equidigital number, since it uses as much as digits as its factorization.

111221100212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614481216822.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111221100212021 its reverse (120212001122111), we get a palindrome (231433101334132).

The spelling of 111221100212021 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred million, two hundred twelve thousand, twenty-one".