211012020021221 has 2 divisors, whose sum is σ = 211012020021222. Its totient is φ = 211012020021220.

The previous prime is 211012020021199. The next prime is 211012020021263. The reversal of 211012020021221 is 122120020210112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184075401018721 + 26936619002500 = 13567439^2 + 5190050^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012020021221 - 2²⁶ = 211011952912357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211012020021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211012020021421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105506010010610 + 105506010010611.

It is an arithmetic number, because the mean of its divisors is an integer number (105506010010611).

Almost surely, 2^{211012020021221} is an apocalyptic number.

It is an amenable number.

211012020021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211012020021221 is an equidigital number, since it uses as much as digits as its factorization.

211012020021221 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 211012020021221 its reverse (122120020210112), we get a palindrome (333132040231333).

The spelling of 211012020021221 in words is "two hundred eleven trillion, twelve billion, twenty million, twenty-one thousand, two hundred twenty-one".