102021122012221 has 2 divisors, whose sum is σ = 102021122012222. Its totient is φ = 102021122012220.

The previous prime is 102021122012213. The next prime is 102021122012263. The reversal of 102021122012221 is 122210221120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73972298511225 + 28048823500996 = 8600715^2 + 5296114^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021122012221 - 2³ = 102021122012213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021122012521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010561006110 + 51010561006111.

It is an arithmetic number, because the mean of its divisors is an integer number (51010561006111).

Almost surely, 2^{102021122012221} is an apocalyptic number.

It is an amenable number.

102021122012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021122012221 is an equidigital number, since it uses as much as digits as its factorization.

102021122012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 102021122012221 its reverse (122210221120201), we get a palindrome (224231343132422).

The spelling of 102021122012221 in words is "one hundred two trillion, twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-one".