211021220100221 has 2 divisors, whose sum is σ = 211021220100222. Its totient is φ = 211021220100220.

The previous prime is 211021220100191. The next prime is 211021220100239. The reversal of 211021220100221 is 122001022120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175078916964121 + 35942303136100 = 13231739^2 + 5995190^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021220100221 - 2⁴⁶ = 140652475922557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211021220100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021220102221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510610050110 + 105510610050111.

It is an arithmetic number, because the mean of its divisors is an integer number (105510610050111).

Almost surely, 2^{211021220100221} is an apocalyptic number.

It is an amenable number.

211021220100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021220100221 is an equidigital number, since it uses as much as digits as its factorization.

211021220100221 is an evil number, because the sum of its binary digits is even.

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

Adding to 211021220100221 its reverse (122001022120112), we get a palindrome (333022242220333).

The spelling of 211021220100221 in words is "two hundred eleven trillion, twenty-one billion, two hundred twenty million, one hundred thousand, two hundred twenty-one".