102002120221 has 2 divisors, whose sum is σ = 102002120222. Its totient is φ = 102002120220.

The previous prime is 102002120203. The next prime is 102002120237. The reversal of 102002120221 is 122021200201.

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., 89514057721 + 12488062500 = 299189^2 + 111750^2 .

It is a cyclic number.

It is not a de Polignac number, because 102002120221 - 2¹⁹ = 102001595933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102002120821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51001060110 + 51001060111.

It is an arithmetic number, because the mean of its divisors is an integer number (51001060111).

Almost surely, 2^102002120221 is an apocalyptic number.

It is an amenable number.

102002120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102002120221 is an equidigital number, since it uses as much as digits as its factorization.

102002120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102002120221 its reverse (122021200201), we get a palindrome (224023320422).

The spelling of 102002120221 in words is "one hundred two billion, two million, one hundred twenty thousand, two hundred twenty-one".