200212221221 has 16 divisors (see below), whose sum is σ = 205514398320. Its totient is φ = 194977912320.

The previous prime is 200212221203. The next prime is 200212221239. The reversal of 200212221221 is 122122212002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (200212221203) and next prime (200212221239).

It can be written as a sum of positive squares in 8 ways, for example, as 31644496321 + 168567724900 = 177889^2 + 410570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200212221221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 200212221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200212221421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9517511 + ... + 9538523.

It is an arithmetic number, because the mean of its divisors is an integer number (12844649895).

Almost surely, 2^200212221221 is an apocalyptic number.

It is an amenable number.

200212221221 is a deficient number, since it is larger than the sum of its proper divisors (5302177099).

200212221221 is a wasteful number, since it uses less digits than its factorization.

200212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22616.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 200212221221 its reverse (122122212002), we get a palindrome (322334433223).

The spelling of 200212221221 in words is "two hundred billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".