12225543121 has 4 divisors (see below), whose sum is σ = 13336956144. Its totient is φ = 11114130100.

The previous prime is 12225543107. The next prime is 12225543157. The reversal of 12225543121 is 12134552221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12225543121 - 2¹⁹ = 12225018833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12225543121.

It is not an unprimeable number, because it can be changed into a prime (12225543101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555706495 + ... + 555706516.

It is an arithmetic number, because the mean of its divisors is an integer number (3334239036).

Almost surely, 2^12225543121 is an apocalyptic number.

12225543121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12225543121 is a deficient number, since it is larger than the sum of its proper divisors (1111413023).

12225543121 is a wasteful number, since it uses less digits than its factorization.

12225543121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111413022.

The product of its digits is 4800, while the sum is 28.

The spelling of 12225543121 in words is "twelve billion, two hundred twenty-five million, five hundred forty-three thousand, one hundred twenty-one".