211020201221117 has 2 divisors, whose sum is σ = 211020201221118. Its totient is φ = 211020201221116.

The previous prime is 211020201221101. The next prime is 211020201221173. The reversal of 211020201221117 is 711122102020112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208076989915876 + 2943211305241 = 14424874^2 + 1715579^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020201221117 - 2⁴ = 211020201221101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211020201221092 and 211020201221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020203221117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510100610558 + 105510100610559.

It is an arithmetic number, because the mean of its divisors is an integer number (105510100610559).

Almost surely, 2^{211020201221117} is an apocalyptic number.

It is an amenable number.

211020201221117 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020201221117 is an equidigital number, since it uses as much as digits as its factorization.

211020201221117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 211020201221117 its reverse (711122102020112), we get a palindrome (922142303241229).

The spelling of 211020201221117 in words is "two hundred eleven trillion, twenty billion, two hundred one million, two hundred twenty-one thousand, one hundred seventeen".