20200202021 has 2 divisors, whose sum is σ = 20200202022. Its totient is φ = 20200202020.

The previous prime is 20200201993. The next prime is 20200202041. The reversal of 20200202021 is 12020200202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10381572100 + 9818629921 = 101890^2 + 99089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200202021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20200201993 and 20200202011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200202041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100101010 + 10100101011.

It is an arithmetic number, because the mean of its divisors is an integer number (10100101011).

Almost surely, 2^20200202021 is an apocalyptic number.

It is an amenable number.

20200202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200202021 is an equidigital number, since it uses as much as digits as its factorization.

20200202021 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 11.

Adding to 20200202021 its reverse (12020200202), we get a palindrome (32220402223).

The spelling of 20200202021 in words is "twenty billion, two hundred million, two hundred two thousand, twenty-one".