10102000021 has 2 divisors, whose sum is σ = 10102000022. Its totient is φ = 10102000020.

The previous prime is 10101999967. The next prime is 10102000043. The reversal of 10102000021 is 12000020101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7195280625 + 2906719396 = 84825^2 + 53914^2 .

It is a cyclic number.

It is not a de Polignac number, because 10102000021 - 2²³ = 10093611413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10101999968 and 10102000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10102006021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051000010 + 5051000011.

It is an arithmetic number, because the mean of its divisors is an integer number (5051000011).

Almost surely, 2^10102000021 is an apocalyptic number.

It is an amenable number.

10102000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10102000021 is an equidigital number, since it uses as much as digits as its factorization.

10102000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10102000021 its reverse (12000020101), we get a palindrome (22102020122).

The spelling of 10102000021 in words is "ten billion, one hundred two million, twenty-one", and thus it is an aban number.