211002101221 has 2 divisors, whose sum is σ = 211002101222. Its totient is φ = 211002101220.

The previous prime is 211002101207. The next prime is 211002101243. The reversal of 211002101221 is 122101200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210235088196 + 767013025 = 458514^2 + 27695^2 .

It is a cyclic number.

It is not a de Polignac number, because 211002101221 - 2²¹ = 211000004069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211002101201) 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, 105501050610 + 105501050611.

It is an arithmetic number, because the mean of its divisors is an integer number (105501050611).

Almost surely, 2^211002101221 is an apocalyptic number.

It is an amenable number.

211002101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211002101221 is an equidigital number, since it uses as much as digits as its factorization.

211002101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211002101221 its reverse (122101200112), we get a palindrome (333103301333).

The spelling of 211002101221 in words is "two hundred eleven billion, two million, one hundred one thousand, two hundred twenty-one".