22002121202221 has 2 divisors, whose sum is σ = 22002121202222. Its totient is φ = 22002121202220.

The previous prime is 22002121202219. The next prime is 22002121202227. The reversal of 22002121202221 is 12220212120022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21327669639721 + 674451562500 = 4618189^2 + 821250^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002121202221 - 2¹ = 22002121202219 is a prime.

Together with 22002121202219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22002121202227) 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 as a sum of consecutive naturals, namely, 11001060601110 + 11001060601111.

It is an arithmetic number, because the mean of its divisors is an integer number (11001060601111).

Almost surely, 2^{22002121202221} is an apocalyptic number.

It is an amenable number.

22002121202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22002121202221 is an equidigital number, since it uses as much as digits as its factorization.

22002121202221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 22002121202221 its reverse (12220212120022), we get a palindrome (34222333322243).

The spelling of 22002121202221 in words is "twenty-two trillion, two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".