102201221021 has 2 divisors, whose sum is σ = 102201221022. Its totient is φ = 102201221020.

The previous prime is 102201220997. The next prime is 102201221039. The reversal of 102201221021 is 120122102201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92726340100 + 9474880921 = 304510^2 + 97339^2 .

It is an emirp because it is prime and its reverse (120122102201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102201221021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102201220987 and 102201221005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102201221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51100610510 + 51100610511.

It is an arithmetic number, because the mean of its divisors is an integer number (51100610511).

Almost surely, 2^102201221021 is an apocalyptic number.

It is an amenable number.

102201221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102201221021 is an equidigital number, since it uses as much as digits as its factorization.

102201221021 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 102201221021 its reverse (120122102201), we get a palindrome (222323323222).

The spelling of 102201221021 in words is "one hundred two billion, two hundred one million, two hundred twenty-one thousand, twenty-one".