111220221021 has 96 divisors (see below), whose sum is σ = 188664053760. Its totient is φ = 57757504896.

The previous prime is 111220221019. The next prime is 111220221071. The reversal of 111220221021 is 120122022111.

It is not a de Polignac number, because 111220221021 - 2¹ = 111220221019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220221001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 66878436 + ... + 66880098.

It is an arithmetic number, because the mean of its divisors is an integer number (1965250560).

Almost surely, 2^111220221021 is an apocalyptic number.

It is an amenable number.

111220221021 is a deficient number, since it is larger than the sum of its proper divisors (77443832739).

111220221021 is a wasteful number, since it uses less digits than its factorization.

111220221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111220221021 its reverse (120122022111), we get a palindrome (231342243132).

The spelling of 111220221021 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, twenty-one".