221122121220220 has 48 divisors (see below), whose sum is σ = 506654094346848. Its totient is φ = 80394803343360.

The previous prime is 221122121220181. The next prime is 221122121220251. The reversal of 221122121220220 is 22022121221122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221122121220191 and 221122121220200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81415509 + ... + 84087628.

It is an arithmetic number, because the mean of its divisors is an integer number (10555293632226).

Almost surely, 2^{221122121220220} is an apocalyptic number.

221122121220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221122121220220 is an abundant number, since it is smaller than the sum of its proper divisors (285531973126628).

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

221122121220220 is a wasteful number, since it uses less digits than its factorization.

221122121220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165509230 (or 165509228 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221122121220220 its reverse (22022121221122), we get a palindrome (243144242441342).

The spelling of 221122121220220 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty".