111220201021 has 4 divisors (see below), whose sum is σ = 111227208832. Its totient is φ = 111213193212.

The previous prime is 111220201019. The next prime is 111220201049. The reversal of 111220201021 is 120102022111.

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 111220201021 - 2¹ = 111220201019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220200992 and 111220201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220201061) 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, 3480045 + ... + 3511858.

It is an arithmetic number, because the mean of its divisors is an integer number (27806802208).

Almost surely, 2^111220201021 is an apocalyptic number.

It is an amenable number.

111220201021 is a deficient number, since it is larger than the sum of its proper divisors (7007811).

111220201021 is an equidigital number, since it uses as much as digits as its factorization.

111220201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007810.

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

Adding to 111220201021 its reverse (120102022111), we get a palindrome (231322223132).

The spelling of 111220201021 in words is "one hundred eleven billion, two hundred twenty million, two hundred one thousand, twenty-one".