111221020111 has 4 divisors (see below), whose sum is σ = 112787513424. Its totient is φ = 109654526800.

The previous prime is 111221020109. The next prime is 111221020117. The reversal of 111221020111 is 111020122111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111221020111 - 2¹ = 111221020109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221020091 and 111221020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221020117) 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, 783246550 + ... + 783246691.

It is an arithmetic number, because the mean of its divisors is an integer number (28196878356).

Almost surely, 2^111221020111 is an apocalyptic number.

111221020111 is a deficient number, since it is larger than the sum of its proper divisors (1566493313).

111221020111 is an equidigital number, since it uses as much as digits as its factorization.

111221020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566493312.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111221020111 its reverse (111020122111), we get a palindrome (222241142222).

The spelling of 111221020111 in words is "one hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred eleven".