102220121221 has 2 divisors, whose sum is σ = 102220121222. Its totient is φ = 102220121220.

The previous prime is 102220121197. The next prime is 102220121233. The reversal of 102220121221 is 122121022201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54702660996 + 47517460225 = 233886^2 + 217985^2 .

It is an emirp because it is prime and its reverse (122121022201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102220121221 - 2⁵ = 102220121189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102220121195 and 102220121204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102220121021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110060610 + 51110060611.

It is an arithmetic number, because the mean of its divisors is an integer number (51110060611).

Almost surely, 2^102220121221 is an apocalyptic number.

It is an amenable number.

102220121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102220121221 is an equidigital number, since it uses as much as digits as its factorization.

102220121221 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 16.

Adding to 102220121221 its reverse (122121022201), we get a palindrome (224341143422).

The spelling of 102220121221 in words is "one hundred two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".