1222200212221 has 4 divisors (see below), whose sum is σ = 1286526539200. Its totient is φ = 1157873885244.

The previous prime is 1222200212173. The next prime is 1222200212231. The reversal of 1222200212221 is 1222120022221.

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 1222200212221 - 2¹¹ = 1222200210173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 64326326959 = 1222200212221 / (1 + 2 + 2 + 2 + 2 + 0 + 0 + 2 + 1 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222200212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32163163461 + ... + 32163163498.

It is an arithmetic number, because the mean of its divisors is an integer number (321631634800).

Almost surely, 2^{1222200212221} is an apocalyptic number.

It is an amenable number.

1222200212221 is a deficient number, since it is larger than the sum of its proper divisors (64326326979).

1222200212221 is an equidigital number, since it uses as much as digits as its factorization.

1222200212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64326326978.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1222200212221 its reverse (1222120022221), we get a palindrome (2444320234442).

The spelling of 1222200212221 in words is "one trillion, two hundred twenty-two billion, two hundred million, two hundred twelve thousand, two hundred twenty-one".