10221121212121 has 2 divisors, whose sum is σ = 10221121212122. Its totient is φ = 10221121212120.

The previous prime is 10221121212109. The next prime is 10221121212163. The reversal of 10221121212121 is 12121212112201.

It is a happy number.

10221121212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7642322025625 + 2578799186496 = 2764475^2 + 1605864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221121212121 is a prime.

It is not a weakly prime, because it can be changed into another prime (10221121212821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110560606060 + 5110560606061.

It is an arithmetic number, because the mean of its divisors is an integer number (5110560606061).

Almost surely, 2^{10221121212121} is an apocalyptic number.

It is an amenable number.

10221121212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221121212121 is an equidigital number, since it uses as much as digits as its factorization.

10221121212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 10221121212121 its reverse (12121212112201), we get a palindrome (22342333324322).

The spelling of 10221121212121 in words is "ten trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".