210020102122021 has 2 divisors, whose sum is σ = 210020102122022. Its totient is φ = 210020102122020.

The previous prime is 210020102121979. The next prime is 210020102122121. The reversal of 210020102122021 is 120221201020012.

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., 136497863232900 + 73522238889121 = 11683230^2 + 8574511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210020102122021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210020102121986 and 210020102122004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020102122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010051061010 + 105010051061011.

It is an arithmetic number, because the mean of its divisors is an integer number (105010051061011).

Almost surely, 2^{210020102122021} is an apocalyptic number.

It is an amenable number.

210020102122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020102122021 is an equidigital number, since it uses as much as digits as its factorization.

210020102122021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210020102122021 its reverse (120221201020012), we get a palindrome (330241303142033).

The spelling of 210020102122021 in words is "two hundred ten trillion, twenty billion, one hundred two million, one hundred twenty-two thousand, twenty-one".