111102220021 has 4 divisors (see below), whose sum is σ = 119648544652. Its totient is φ = 102555895392.

The previous prime is 111102220007. The next prime is 111102220069. The reversal of 111102220021 is 120022201111.

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 61484657521 + 49617562500 = 247961^2 + 222750^2 .

It is a cyclic number.

It is not a de Polignac number, because 111102220021 - 2²³ = 111093831413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 8546324617 = 111102220021 / (1 + 1 + 1 + 1 + 0 + 2 + 2 + 2 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 111102219983 and 111102220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102220921) 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, 4273162296 + ... + 4273162321.

It is an arithmetic number, because the mean of its divisors is an integer number (29912136163).

Almost surely, 2^111102220021 is an apocalyptic number.

It is an amenable number.

111102220021 is a deficient number, since it is larger than the sum of its proper divisors (8546324631).

111102220021 is an equidigital number, since it uses as much as digits as its factorization.

111102220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546324630.

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

Adding to 111102220021 its reverse (120022201111), we get a palindrome (231124421132).

The spelling of 111102220021 in words is "one hundred eleven billion, one hundred two million, two hundred twenty thousand, twenty-one".