211021101217 has 2 divisors, whose sum is σ = 211021101218. Its totient is φ = 211021101216.

The previous prime is 211021101157. The next prime is 211021101251. The reversal of 211021101217 is 712101120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208849914001 + 2171187216 = 457001^2 + 46596^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021101217 - 2⁷ = 211021101089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211021101194 and 211021101203.

It is not a weakly prime, because it can be changed into another prime (211021101817) 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, 105510550608 + 105510550609.

It is an arithmetic number, because the mean of its divisors is an integer number (105510550609).

Almost surely, 2^211021101217 is an apocalyptic number.

It is an amenable number.

211021101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021101217 is an equidigital number, since it uses as much as digits as its factorization.

211021101217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 211021101217 its reverse (712101120112), we get a palindrome (923122221329).

The spelling of 211021101217 in words is "two hundred eleven billion, twenty-one million, one hundred one thousand, two hundred seventeen".