210021111317 has 2 divisors, whose sum is σ = 210021111318. Its totient is φ = 210021111316.

The previous prime is 210021111283. The next prime is 210021111343. The reversal of 210021111317 is 713111120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107391222436 + 102629888881 = 327706^2 + 320359^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021111317 - 2⁶ = 210021111253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021110317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010555658 + 105010555659.

It is an arithmetic number, because the mean of its divisors is an integer number (105010555659).

Almost surely, 2^210021111317 is an apocalyptic number.

It is an amenable number.

210021111317 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021111317 is an equidigital number, since it uses as much as digits as its factorization.

210021111317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 20.

Adding to 210021111317 its reverse (713111120012), we get a palindrome (923132231329).

The spelling of 210021111317 in words is "two hundred ten billion, twenty-one million, one hundred eleven thousand, three hundred seventeen".