12222021220 has 24 divisors (see below), whose sum is σ = 25678256184. Its totient is φ = 4886520576.

The previous prime is 12222021173. The next prime is 12222021257. The reversal of 12222021220 is 2212022221.

It can be written as a sum of positive squares in 4 ways, for example, as 307862116 + 11914159104 = 17546^2 + 109152^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12222021194 and 12222021203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98859 + ... + 184978.

It is an arithmetic number, because the mean of its divisors is an integer number (1069927341).

Almost surely, 2^12222021220 is an apocalyptic number.

12222021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12222021220 is an abundant number, since it is smaller than the sum of its proper divisors (13456234964).

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

12222021220 is a wasteful number, since it uses less digits than its factorization.

12222021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285999 (or 285997 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 12222021220 its reverse (2212022221), we get a palindrome (14434043441).

The spelling of 12222021220 in words is "twelve billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty".