20210102200021 has 2 divisors, whose sum is σ = 20210102200022. Its totient is φ = 20210102200020.

The previous prime is 20210102199971. The next prime is 20210102200103. The reversal of 20210102200021 is 12000220101202.

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., 15669959760900 + 4540142439121 = 3958530^2 + 2130761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210102200021 - 2⁷ = 20210102199893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210102199974 and 20210102200010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210102200721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105051100010 + 10105051100011.

It is an arithmetic number, because the mean of its divisors is an integer number (10105051100011).

Almost surely, 2^{20210102200021} is an apocalyptic number.

It is an amenable number.

20210102200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210102200021 is an equidigital number, since it uses as much as digits as its factorization.

20210102200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20210102200021 its reverse (12000220101202), we get a palindrome (32210322301223).

The spelling of 20210102200021 in words is "twenty trillion, two hundred ten billion, one hundred two million, two hundred thousand, twenty-one".