102120002081 has 2 divisors, whose sum is σ = 102120002082. Its totient is φ = 102120002080.

The previous prime is 102120002071. The next prime is 102120002123. The reversal of 102120002081 is 180200021201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89808102400 + 12311899681 = 299680^2 + 110959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102120002081 is a prime.

It is a super-2 number, since 2×102120002081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102120002011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060001040 + 51060001041.

It is an arithmetic number, because the mean of its divisors is an integer number (51060001041).

Almost surely, 2^102120002081 is an apocalyptic number.

It is an amenable number.

102120002081 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120002081 is an equidigital number, since it uses as much as digits as its factorization.

102120002081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102120002081 its reverse (180200021201), we get a palindrome (282320023282).

The spelling of 102120002081 in words is "one hundred two billion, one hundred twenty million, two thousand, eighty-one".