202020110021 has 2 divisors, whose sum is σ = 202020110022. Its totient is φ = 202020110020.

The previous prime is 202020110003. The next prime is 202020110069. The reversal of 202020110021 is 120011020202.

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., 185837725921 + 16182384100 = 431089^2 + 127210^2 .

It is a cyclic number.

It is not a de Polignac number, because 202020110021 - 2¹⁸ = 202019847877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202020109984 and 202020110011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202020130021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010055010 + 101010055011.

It is an arithmetic number, because the mean of its divisors is an integer number (101010055011).

Almost surely, 2^202020110021 is an apocalyptic number.

It is an amenable number.

202020110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202020110021 is an equidigital number, since it uses as much as digits as its factorization.

202020110021 is an evil number, because the sum of its binary digits is even.

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

Adding to 202020110021 its reverse (120011020202), we get a palindrome (322031130223).

The spelling of 202020110021 in words is "two hundred two billion, twenty million, one hundred ten thousand, twenty-one".