201211021202117 has 2 divisors, whose sum is σ = 201211021202118. Its totient is φ = 201211021202116.

The previous prime is 201211021202071. The next prime is 201211021202131. The reversal of 201211021202117 is 711202120112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201185884368001 + 25136834116 = 14184001^2 + 158546^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211021202117 - 2⁶ = 201211021202053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201211021202092 and 201211021202101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211021202197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605510601058 + 100605510601059.

It is an arithmetic number, because the mean of its divisors is an integer number (100605510601059).

Almost surely, 2^{201211021202117} is an apocalyptic number.

It is an amenable number.

201211021202117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211021202117 is an equidigital number, since it uses as much as digits as its factorization.

201211021202117 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201211021202117 its reverse (711202120112102), we get a palindrome (912413141314219).

The spelling of 201211021202117 in words is "two hundred one trillion, two hundred eleven billion, twenty-one million, two hundred two thousand, one hundred seventeen".