12200221121 has 4 divisors (see below), whose sum is σ = 13309332144. Its totient is φ = 11091110100.

The previous prime is 12200221109. The next prime is 12200221127. The reversal of 12200221121 is 12112200221.

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 a de Polignac number, because none of the positive numbers 2^k-12200221121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12200221096 and 12200221105.

It is not an unprimeable number, because it can be changed into a prime (12200221127) 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, 554555495 + ... + 554555516.

It is an arithmetic number, because the mean of its divisors is an integer number (3327333036).

Almost surely, 2^12200221121 is an apocalyptic number.

12200221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12200221121 is a deficient number, since it is larger than the sum of its proper divisors (1109111023).

12200221121 is a wasteful number, since it uses less digits than its factorization.

12200221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109111022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12200221121 its reverse (12112200221), we get a palindrome (24312421342).

It can be divided in two parts, 12200221 and 121, that multiplied together give a palindrome (1476226741).

The spelling of 12200221121 in words is "twelve billion, two hundred million, two hundred twenty-one thousand, one hundred twenty-one".