221110112021220 has 72 divisors (see below), whose sum is σ = 670857271471296. Its totient is φ = 58948929652032.

The previous prime is 221110112021191. The next prime is 221110112021273. The reversal of 221110112021220 is 22120211011122.

221110112021220 is a `hidden beast` number, since 2 + 211 + 101 + 120 + 212 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221110112021193 and 221110112021202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142631992 + ... + 144173871.

It is an arithmetic number, because the mean of its divisors is an integer number (9317462103768).

Almost surely, 2^{221110112021220} is an apocalyptic number.

221110112021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221110112021220 is an abundant number, since it is smaller than the sum of its proper divisors (449747159450076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221110112021220 is a wasteful number, since it uses less digits than its factorization.

221110112021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286810161 (or 286810156 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221110112021220 its reverse (22120211011122), we get a palindrome (243230323032342).

The spelling of 221110112021220 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred twelve million, twenty-one thousand, two hundred twenty".