10210221221 has 2 divisors, whose sum is σ = 10210221222. Its totient is φ = 10210221220.

The previous prime is 10210221211. The next prime is 10210221227. The reversal of 10210221221 is 12212201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9853540225 + 356680996 = 99265^2 + 18886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10210221221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10210221196 and 10210221205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10210221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105110610 + 5105110611.

It is an arithmetic number, because the mean of its divisors is an integer number (5105110611).

Almost surely, 2^10210221221 is an apocalyptic number.

It is an amenable number.

10210221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10210221221 is an equidigital number, since it uses as much as digits as its factorization.

10210221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10210221221 its reverse (12212201201), we get a palindrome (22422422422).

The spelling of 10210221221 in words is "ten billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".