211000100221 has 2 divisors, whose sum is σ = 211000100222. Its totient is φ = 211000100220.

The previous prime is 211000100197. The next prime is 211000100237. The reversal of 211000100221 is 122001000112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181357591321 + 29642508900 = 425861^2 + 172170^2 .

It is a cyclic number.

It is not a de Polignac number, because 211000100221 - 2²⁹ = 210463229309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211000100198 and 211000100207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211000100021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500050110 + 105500050111.

It is an arithmetic number, because the mean of its divisors is an integer number (105500050111).

Almost surely, 2^211000100221 is an apocalyptic number.

It is an amenable number.

211000100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211000100221 is an equidigital number, since it uses as much as digits as its factorization.

211000100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 211000100221 its reverse (122001000112), we get a palindrome (333001100333).

The spelling of 211000100221 in words is "two hundred eleven billion, one hundred thousand, two hundred twenty-one".