102820200121 has 2 divisors, whose sum is σ = 102820200122. Its totient is φ = 102820200120.

The previous prime is 102820200023. The next prime is 102820200149. The reversal of 102820200121 is 121002028201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102105172521 + 715027600 = 319539^2 + 26740^2 .

It is a cyclic number.

It is not a de Polignac number, because 102820200121 - 2²⁷ = 102685982393 is a prime.

It is not a weakly prime, because it can be changed into another prime (102820290121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51410100060 + 51410100061.

It is an arithmetic number, because the mean of its divisors is an integer number (51410100061).

Almost surely, 2^102820200121 is an apocalyptic number.

It is an amenable number.

102820200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

102820200121 is an equidigital number, since it uses as much as digits as its factorization.

102820200121 is an evil number, because the sum of its binary digits is even.

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

Adding to 102820200121 its reverse (121002028201), we get a palindrome (223822228322).

The spelling of 102820200121 in words is "one hundred two billion, eight hundred twenty million, two hundred thousand, one hundred twenty-one".