102020102000021 has 2 divisors, whose sum is σ = 102020102000022. Its totient is φ = 102020102000020.

The previous prime is 102020101999897. The next prime is 102020102000023. The reversal of 102020102000021 is 120000201020201.

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., 101175715600996 + 844386399025 = 10058614^2 + 918905^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020102000021 - 2⁴² = 97622055488917 is a prime.

Together with 102020102000023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 102020101999966 and 102020102000011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102020102000023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010051000010 + 51010051000011.

It is an arithmetic number, because the mean of its divisors is an integer number (51010051000011).

Almost surely, 2^{102020102000021} is an apocalyptic number.

It is an amenable number.

102020102000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020102000021 is an equidigital number, since it uses as much as digits as its factorization.

102020102000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102020102000021 its reverse (120000201020201), we get a palindrome (222020303020222).

The spelling of 102020102000021 in words is "one hundred two trillion, twenty billion, one hundred two million, twenty-one", and thus it is an aban number.