212021111110121 has 2 divisors, whose sum is σ = 212021111110122. Its totient is φ = 212021111110120.

The previous prime is 212021111110097. The next prime is 212021111110189. The reversal of 212021111110121 is 121011111120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121752775178896 + 90268335931225 = 11034164^2 + 9500965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021111110121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021111110121.

It is not a weakly prime, because it can be changed into another prime (212021111110421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010555555060 + 106010555555061.

It is an arithmetic number, because the mean of its divisors is an integer number (106010555555061).

Almost surely, 2^{212021111110121} is an apocalyptic number.

It is an amenable number.

212021111110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021111110121 is an equidigital number, since it uses as much as digits as its factorization.

212021111110121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212021111110121 its reverse (121011111120212), we get a palindrome (333032222230333).

The spelling of 212021111110121 in words is "two hundred twelve trillion, twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-one".