221122222020 has 144 divisors (see below), whose sum is σ = 766951506048. Its totient is φ = 50516213760.

The previous prime is 221122221997. The next prime is 221122222037. The reversal of 221122222020 is 20222221122.

221122222020 is a `hidden beast` number, since 221 + 1 + 222 + 220 + 2 + 0 = 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 = 221122221984 and 221122222002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2459460 + ... + 2547780.

Almost surely, 2^221122222020 is an apocalyptic number.

221122222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221122222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383475753024).

221122222020 is an abundant number, since it is smaller than the sum of its proper divisors (545829284028).

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

221122222020 is a wasteful number, since it uses less digits than its factorization.

221122222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90330 (or 90325 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221122222020 its reverse (20222221122), we get a palindrome (241344443142).

The spelling of 221122222020 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, twenty".