111020012221 has 4 divisors (see below), whose sum is σ = 111305411100. Its totient is φ = 110734613344.

The previous prime is 111020012209. The next prime is 111020012231. The reversal of 111020012221 is 122210020111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122210020111 = 3407 ⋅35870273.

It can be written as a sum of positive squares in 2 ways, for example, as 64368764100 + 46651248121 = 253710^2 + 215989^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020012221 - 2⁵ = 111020012189 is a prime.

It is a super-2 number, since 2×111020012221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020012231) 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 3 ways as a sum of consecutive naturals, for example, 142698856 + ... + 142699633.

It is an arithmetic number, because the mean of its divisors is an integer number (27826352775).

Almost surely, 2^111020012221 is an apocalyptic number.

It is an amenable number.

111020012221 is a deficient number, since it is larger than the sum of its proper divisors (285398879).

111020012221 is an equidigital number, since it uses as much as digits as its factorization.

111020012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285398878.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111020012221 its reverse (122210020111), we get a palindrome (233230032332).

The spelling of 111020012221 in words is "one hundred eleven billion, twenty million, twelve thousand, two hundred twenty-one".