10121210022221 has 2 divisors, whose sum is σ = 10121210022222. Its totient is φ = 10121210022220.

The previous prime is 10121210022181. The next prime is 10121210022239. The reversal of 10121210022221 is 12222001212101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9059413732996 + 1061796289225 = 3009886^2 + 1030435^2 .

It is an emirp because it is prime and its reverse (12222001212101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10121210022221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121210022221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121210022421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060605011110 + 5060605011111.

It is an arithmetic number, because the mean of its divisors is an integer number (5060605011111).

Almost surely, 2^{10121210022221} is an apocalyptic number.

It is an amenable number.

10121210022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121210022221 is an equidigital number, since it uses as much as digits as its factorization.

10121210022221 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 17.

Adding to 10121210022221 its reverse (12222001212101), we get a palindrome (22343211234322).

The spelling of 10121210022221 in words is "ten trillion, one hundred twenty-one billion, two hundred ten million, twenty-two thousand, two hundred twenty-one".