12122222220 has 144 divisors (see below), whose sum is σ = 38541484800. Its totient is φ = 3078185088.

The previous prime is 12122222213. The next prime is 12122222221. The reversal of 12122222220 is 2222222121.

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 = 12122222193 and 12122222202.

It is not an unprimeable number, because it can be changed into a prime (12122222221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 933331 + ... + 946229.

It is an arithmetic number, because the mean of its divisors is an integer number (267649200).

Almost surely, 2^12122222220 is an apocalyptic number.

12122222220 is a gapful number since it is divisible by the number (10) 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 12122222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19270742400).

12122222220 is an abundant number, since it is smaller than the sum of its proper divisors (26419262580).

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

12122222220 is a wasteful number, since it uses less digits than its factorization.

12122222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13164 (or 13159 counting only the distinct ones).

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

Adding to 12122222220 its reverse (2222222121), we get a palindrome (14344444341).

Subtracting from 12122222220 its reverse (2222222121), we obtain a palindrome (9900000099).

The spelling of 12122222220 in words is "twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".