12205202121 has 64 divisors (see below), whose sum is σ = 21794764800. Its totient is φ = 6594499008.

The previous prime is 12205202111. The next prime is 12205202203. The reversal of 12205202121 is 12120250221.

12205202121 is a `hidden beast` number, since 1 + 2 + 20 + 520 + 2 + 121 = 666.

It is not a de Polignac number, because 12205202121 - 2⁵ = 12205202089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12205202094 and 12205202103.

It is not an unprimeable number, because it can be changed into a prime (12205202111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2018715 + ... + 2024751.

It is an arithmetic number, because the mean of its divisors is an integer number (340543200).

Almost surely, 2^12205202121 is an apocalyptic number.

It is an amenable number.

12205202121 is a deficient number, since it is larger than the sum of its proper divisors (9589562679).

12205202121 is a wasteful number, since it uses less digits than its factorization.

12205202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6635 (or 6629 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 12205202121 its reverse (12120250221), we get a palindrome (24325452342).

The spelling of 12205202121 in words is "twelve billion, two hundred five million, two hundred two thousand, one hundred twenty-one".