12222121220 has 24 divisors (see below), whose sum is σ = 25668557208. Its totient is φ = 4888448000.

The previous prime is 12222121217. The next prime is 12222121243. The reversal of 12222121220 is 2212122221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2358850624 + 9863270596 = 48568^2 + 99314^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407540 + ... + 436500.

It is an arithmetic number, because the mean of its divisors is an integer number (1069523217).

Almost surely, 2^12222121220 is an apocalyptic number.

12222121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12222121220 is an abundant number, since it is smaller than the sum of its proper divisors (13446435988).

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

12222121220 is a wasteful number, since it uses less digits than its factorization.

12222121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50071 (or 50069 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12222121220 its reverse (2212122221), we get a palindrome (14434243441).

The spelling of 12222121220 in words is "twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".