1210221212117 has 2 divisors, whose sum is σ = 1210221212118. Its totient is φ = 1210221212116.

The previous prime is 1210221212063. The next prime is 1210221212131. The reversal of 1210221212117 is 7112121220121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 877717901956 + 332503310161 = 936866^2 + 576631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210221212117 - 2²⁰ = 1210220163541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210221212092 and 1210221212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210221232117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110606058 + 605110606059.

It is an arithmetic number, because the mean of its divisors is an integer number (605110606059).

Almost surely, 2^{1210221212117} is an apocalyptic number.

It is an amenable number.

1210221212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210221212117 is an equidigital number, since it uses as much as digits as its factorization.

1210221212117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 1210221212117 its reverse (7112121220121), we get a palindrome (8322342432238).

The spelling of 1210221212117 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, one hundred seventeen".