2222100012221 has 2 divisors, whose sum is σ = 2222100012222. Its totient is φ = 2222100012220.

The previous prime is 2222100012217. The next prime is 2222100012227. The reversal of 2222100012221 is 1222100012222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1598047411321 + 624052600900 = 1264139^2 + 789970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222100012221 - 2² = 2222100012217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2222100012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222100012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111050006110 + 1111050006111.

It is an arithmetic number, because the mean of its divisors is an integer number (1111050006111).

Almost surely, 2^{2222100012221} is an apocalyptic number.

It is an amenable number.

2222100012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222100012221 is an equidigital number, since it uses as much as digits as its factorization.

2222100012221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2222100012221 its reverse (1222100012222), we get a palindrome (3444200024443).

Subtracting from 2222100012221 its reverse (1222100012222), we obtain a palindrome (999999999999).

It can be divided in two parts, 222210001 and 2221, that added together give a palindrome (222212222).

The spelling of 2222100012221 in words is "two trillion, two hundred twenty-two billion, one hundred million, twelve thousand, two hundred twenty-one".