12200021221 has 4 divisors (see below), whose sum is σ = 12202393932. Its totient is φ = 12197648512.

The previous prime is 12200021209. The next prime is 12200021231. The reversal of 12200021221 is 12212000221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12212000221 = 31 ⋅393935491.

It can be written as a sum of positive squares in 2 ways, for example, as 2702544196 + 9497477025 = 51986^2 + 97455^2 .

It is a cyclic number.

It is not a de Polignac number, because 12200021221 - 2²⁹ = 11663150309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178626 + ... + 1188931.

It is an arithmetic number, because the mean of its divisors is an integer number (3050598483).

Almost surely, 2^12200021221 is an apocalyptic number.

It is an amenable number.

12200021221 is a deficient number, since it is larger than the sum of its proper divisors (2372711).

12200021221 is an equidigital number, since it uses as much as digits as its factorization.

12200021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372710.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12200021221 its reverse (12212000221), we get a palindrome (24412021442).

The spelling of 12200021221 in words is "twelve billion, two hundred million, twenty-one thousand, two hundred twenty-one".