21210120102071 has 2 divisors, whose sum is σ = 21210120102072. Its totient is φ = 21210120102070.

The previous prime is 21210120102019. The next prime is 21210120102151. The reversal of 21210120102071 is 17020102101212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210120102071 - 2⁶ = 21210120102007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210120102571) 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, 10605060051035 + 10605060051036.

It is an arithmetic number, because the mean of its divisors is an integer number (10605060051036).

Almost surely, 2^{21210120102071} is an apocalyptic number.

21210120102071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210120102071 is an equidigital number, since it uses as much as digits as its factorization.

21210120102071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21210120102071 its reverse (17020102101212), we get a palindrome (38230222203283).

The spelling of 21210120102071 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred two thousand, seventy-one".