102100221281 has 2 divisors, whose sum is σ = 102100221282. Its totient is φ = 102100221280.

The previous prime is 102100221269. The next prime is 102100221313. The reversal of 102100221281 is 182122001201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102070026256 + 30195025 = 319484^2 + 5495^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100221281 - 2³⁰ = 101026479457 is a prime.

It is a super-2 number, since 2×102100221281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102100271281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050110640 + 51050110641.

It is an arithmetic number, because the mean of its divisors is an integer number (51050110641).

Almost surely, 2^102100221281 is an apocalyptic number.

It is an amenable number.

102100221281 is a deficient number, since it is larger than the sum of its proper divisors (1).

102100221281 is an equidigital number, since it uses as much as digits as its factorization.

102100221281 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 20.

Adding to 102100221281 its reverse (182122001201), we get a palindrome (284222222482).

The spelling of 102100221281 in words is "one hundred two billion, one hundred million, two hundred twenty-one thousand, two hundred eighty-one".