11021200221221 has 2 divisors, whose sum is σ = 11021200221222. Its totient is φ = 11021200221220.

The previous prime is 11021200221209. The next prime is 11021200221277. The reversal of 11021200221221 is 12212200212011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10619053998721 + 402146222500 = 3258689^2 + 634150^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021200221221 - 2³⁴ = 11004020352037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11021200221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021200221721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510600110610 + 5510600110611.

It is an arithmetic number, because the mean of its divisors is an integer number (5510600110611).

Almost surely, 2^{11021200221221} is an apocalyptic number.

It is an amenable number.

11021200221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021200221221 is an equidigital number, since it uses as much as digits as its factorization.

11021200221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11021200221221 its reverse (12212200212011), we get a palindrome (23233400433232).

The spelling of 11021200221221 in words is "eleven trillion, twenty-one billion, two hundred million, two hundred twenty-one thousand, two hundred twenty-one".