201023213117 has 2 divisors, whose sum is σ = 201023213118. Its totient is φ = 201023213116.

The previous prime is 201023213059. The next prime is 201023213119. The reversal of 201023213117 is 711312320102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198992719396 + 2030493721 = 446086^2 + 45061^2 .

It is a cyclic number.

It is not a de Polignac number, because 201023213117 - 2⁸ = 201023212861 is a prime.

Together with 201023213119, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 201023213092 and 201023213101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201023213119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100511606558 + 100511606559.

It is an arithmetic number, because the mean of its divisors is an integer number (100511606559).

Almost surely, 2^201023213117 is an apocalyptic number.

It is an amenable number.

201023213117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201023213117 is an equidigital number, since it uses as much as digits as its factorization.

201023213117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 201023213117 its reverse (711312320102), we get a palindrome (912335533219).

The spelling of 201023213117 in words is "two hundred one billion, twenty-three million, two hundred thirteen thousand, one hundred seventeen".