12205421120 has 28 divisors (see below), whose sum is σ = 29064159804. Its totient is φ = 4882168320.

The previous prime is 12205421113. The next prime is 12205421143. The reversal of 12205421120 is 2112450221.

It can be written as a sum of positive squares in 2 ways, for example, as 4207338496 + 7998082624 = 64864^2 + 89432^2 .

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 = 12205421092 and 12205421101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19070651 + ... + 19071290.

Almost surely, 2^12205421120 is an apocalyptic number.

12205421120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12205421120 is an abundant number, since it is smaller than the sum of its proper divisors (16858738684).

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

12205421120 is an equidigital number, since it uses as much as digits as its factorization.

12205421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38141958 (or 38141948 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 12205421120 its reverse (2112450221), we get a palindrome (14317871341).

The spelling of 12205421120 in words is "twelve billion, two hundred five million, four hundred twenty-one thousand, one hundred twenty".