210102000002021 has 2 divisors, whose sum is σ = 210102000002022. Its totient is φ = 210102000002020.

The previous prime is 210102000002009. The next prime is 210102000002051. The reversal of 210102000002021 is 120200000201012.

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., 116185763102500 + 93916236899521 = 10778950^2 + 9691039^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102000002021 - 2²⁶ = 210101932893157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210102000001993 and 210102000002011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210102000002051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105051000001010 + 105051000001011.

It is an arithmetic number, because the mean of its divisors is an integer number (105051000001011).

Almost surely, 2^{210102000002021} is an apocalyptic number.

It is an amenable number.

210102000002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102000002021 is an equidigital number, since it uses as much as digits as its factorization.

210102000002021 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 210102000002021 its reverse (120200000201012), we get a palindrome (330302000203033).

The spelling of 210102000002021 in words is "two hundred ten trillion, one hundred two billion, two thousand, twenty-one".