211022100221 has 2 divisors, whose sum is σ = 211022100222. Its totient is φ = 211022100220.

The previous prime is 211022100209. The next prime is 211022100277. The reversal of 211022100221 is 122001220112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208091068900 + 2931031321 = 456170^2 + 54139^2 .

It is a cyclic number.

It is not a de Polignac number, because 211022100221 - 2³⁰ = 209948358397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211022100196 and 211022100205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211022000221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105511050110 + 105511050111.

It is an arithmetic number, because the mean of its divisors is an integer number (105511050111).

Almost surely, 2^211022100221 is an apocalyptic number.

It is an amenable number.

211022100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211022100221 is an equidigital number, since it uses as much as digits as its factorization.

211022100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211022100221 its reverse (122001220112), we get a palindrome (333023320333).

The spelling of 211022100221 in words is "two hundred eleven billion, twenty-two million, one hundred thousand, two hundred twenty-one".