22122220120020 has 144 divisors (see below), whose sum is σ = 67498125366672. Its totient is φ = 5864622520320.

The previous prime is 22122220119931. The next prime is 22122220120067. The reversal of 22122220120020 is 2002102222122.

22122220120020 is a `hidden beast` number, since 2 + 21 + 222 + 201 + 200 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 180602900676 + 21941617219344 = 424974^2 + 4684188^2 .

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 = 22122220119975 and 22122220120002.

It is a congruent number.

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, 433225290 + ... + 433276350.

It is an arithmetic number, because the mean of its divisors is an integer number (468736981713).

Almost surely, 2^{22122220120020} is an apocalyptic number.

22122220120020 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 22122220120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33749062683336).

22122220120020 is an abundant number, since it is smaller than the sum of its proper divisors (45375905246652).

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

22122220120020 is a wasteful number, since it uses less digits than its factorization.

22122220120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65162 (or 65157 counting only the distinct ones).

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

Adding to 22122220120020 its reverse (2002102222122), we get a palindrome (24124322342142).

The spelling of 22122220120020 in words is "twenty-two trillion, one hundred twenty-two billion, two hundred twenty million, one hundred twenty thousand, twenty".