211221230117 has 2 divisors, whose sum is σ = 211221230118. Its totient is φ = 211221230116.

The previous prime is 211221230111. The next prime is 211221230141. The reversal of 211221230117 is 711032122112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197819463361 + 13401766756 = 444769^2 + 115766^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221230117 - 2¹⁴ = 211221213733 is a prime.

It is a super-2 number, since 2×211221230117² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221230092 and 211221230101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221230111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610615058 + 105610615059.

It is an arithmetic number, because the mean of its divisors is an integer number (105610615059).

Almost surely, 2^211221230117 is an apocalyptic number.

It is an amenable number.

211221230117 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221230117 is an equidigital number, since it uses as much as digits as its factorization.

211221230117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 211221230117 its reverse (711032122112), we get a palindrome (922253352229).

The spelling of 211221230117 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thirty thousand, one hundred seventeen".