12211222210220 has 72 divisors (see below), whose sum is σ = 28197227536800. Its totient is φ = 4438790737920.

The previous prime is 12211222210183. The next prime is 12211222210273. The reversal of 12211222210220 is 2201222211221.

It is a super-2 number, since 2×12211222210220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12211222210192 and 12211222210201.

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, 5569121 + ... + 7445639.

Almost surely, 2^{12211222210220} is an apocalyptic number.

12211222210220 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 12211222210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14098613768400).

12211222210220 is an abundant number, since it is smaller than the sum of its proper divisors (15986005326580).

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

12211222210220 is a wasteful number, since it uses less digits than its factorization.

12211222210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879239 (or 1879226 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12211222210220 its reverse (2201222211221), we get a palindrome (14412444421441).

The spelling of 12211222210220 in words is "twelve trillion, two hundred eleven billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty".