111020111221 has 4 divisors (see below), whose sum is σ = 111355519744. Its totient is φ = 110684702700.

The previous prime is 111020111219. The next prime is 111020111263. The reversal of 111020111221 is 122111020111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111020111221 - 2¹ = 111020111219 is a prime.

It is a super-2 number, since 2×111020111221² (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 (111020114221) 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, 167703765 + ... + 167704426.

It is an arithmetic number, because the mean of its divisors is an integer number (27838879936).

Almost surely, 2^111020111221 is an apocalyptic number.

It is an amenable number.

111020111221 is a deficient number, since it is larger than the sum of its proper divisors (335408523).

111020111221 is an equidigital number, since it uses as much as digits as its factorization.

111020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335408522.

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

Adding to 111020111221 its reverse (122111020111), we get a palindrome (233131131332).

The spelling of 111020111221 in words is "one hundred eleven billion, twenty million, one hundred eleven thousand, two hundred twenty-one".