201202100020021 has 2 divisors, whose sum is σ = 201202100020022. Its totient is φ = 201202100020020.

The previous prime is 201202100019997. The next prime is 201202100020049. The reversal of 201202100020021 is 120020001202102.

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., 135059029820100 + 66143070199921 = 11621490^2 + 8132839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201202100020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201202100019983 and 201202100020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201202100027021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100601050010010 + 100601050010011.

It is an arithmetic number, because the mean of its divisors is an integer number (100601050010011).

Almost surely, 2^{201202100020021} is an apocalyptic number.

It is an amenable number.

201202100020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201202100020021 is an equidigital number, since it uses as much as digits as its factorization.

201202100020021 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 201202100020021 its reverse (120020001202102), we get a palindrome (321222101222123).

The spelling of 201202100020021 in words is "two hundred one trillion, two hundred two billion, one hundred million, twenty thousand, twenty-one".