12221205121 has 8 divisors (see below), whose sum is σ = 12464950400. Its totient is φ = 11979686160.

The previous prime is 12221205103. The next prime is 12221205179. The reversal of 12221205121 is 12150212221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12221205121 - 2⁹ = 12221204609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221215121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545490 + ... + 567451.

It is an arithmetic number, because the mean of its divisors is an integer number (1558118800).

Almost surely, 2^12221205121 is an apocalyptic number.

It is an amenable number.

12221205121 is a deficient number, since it is larger than the sum of its proper divisors (243745279).

12221205121 is a wasteful number, since it uses less digits than its factorization.

12221205121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113159.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 12221205121 its reverse (12150212221), we get a palindrome (24371417342).

The spelling of 12221205121 in words is "twelve billion, two hundred twenty-one million, two hundred five thousand, one hundred twenty-one".