202021020101 has 2 divisors, whose sum is σ = 202021020102. Its totient is φ = 202021020100.

The previous prime is 202021020083. The next prime is 202021020109. The reversal of 202021020101 is 101020120202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157411356001 + 44609664100 = 396751^2 + 211210^2 .

It is a cyclic number.

It is not a de Polignac number, because 202021020101 - 2²² = 202016825797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202021020109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010510050 + 101010510051.

It is an arithmetic number, because the mean of its divisors is an integer number (101010510051).

Almost surely, 2^202021020101 is an apocalyptic number.

It is an amenable number.

202021020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021020101 is an equidigital number, since it uses as much as digits as its factorization.

202021020101 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 202021020101 its reverse (101020120202), we get a palindrome (303041140303).

The spelling of 202021020101 in words is "two hundred two billion, twenty-one million, twenty thousand, one hundred one".