111220111010221 has 6 divisors (see below), whose sum is σ = 113636844977390. Its totient is φ = 108853725667416.

The previous prime is 111220111010207. The next prime is 111220111010227. The reversal of 111220111010221 is 122010111022111.

It can be written as a sum of positive squares in only one way, i.e., 107536609640196 + 3683501370025 = 10369986^2 + 1919245^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111220111010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220111010195 and 111220111010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220111010227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25174309926 + ... + 25174314343.

Almost surely, 2^{111220111010221} is an apocalyptic number.

It is an amenable number.

111220111010221 is a deficient number, since it is larger than the sum of its proper divisors (2416733967169).

111220111010221 is an frugal number, since it uses more digits than its factorization.

111220111010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50348624363 (or 50348624316 counting only the distinct ones).

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

Adding to 111220111010221 its reverse (122010111022111), we get a palindrome (233230222032332).

The spelling of 111220111010221 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred eleven million, ten thousand, two hundred twenty-one".