20210211100517 has 2 divisors, whose sum is σ = 20210211100518. Its totient is φ = 20210211100516.

The previous prime is 20210211100493. The next prime is 20210211100567. The reversal of 20210211100517 is 71500111201202.

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., 17409806320036 + 2800404780481 = 4172506^2 + 1673441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210211100517 - 2²⁸ = 20209942665061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210211100492 and 20210211100501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210211100567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105105550258 + 10105105550259.

It is an arithmetic number, because the mean of its divisors is an integer number (10105105550259).

Almost surely, 2^{20210211100517} is an apocalyptic number.

It is an amenable number.

20210211100517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210211100517 is an equidigital number, since it uses as much as digits as its factorization.

20210211100517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 20210211100517 its reverse (71500111201202), we get a palindrome (91710322301719).

The spelling of 20210211100517 in words is "twenty trillion, two hundred ten billion, two hundred eleven million, one hundred thousand, five hundred seventeen".