202021 has 2 divisors, whose sum is σ = 202022. Its totient is φ = 202020.

The previous prime is 202001. The next prime is 202031. The reversal of 202021 is 120202.

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., 171396 + 30625 = 414^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 202021 - 2⁷ = 201893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201995 and 202013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010 + 101011.

It is an arithmetic number, because the mean of its divisors is an integer number (101011).

2²⁰²⁰²¹ is an apocalyptic number.

202021 is the 260-th hex number.

It is an amenable number.

202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021 is an equidigital number, since it uses as much as digits as its factorization.

202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 202021 is about 449.4674626711. The cubic root of 202021 is about 58.6766762937.

Adding to 202021 its reverse (120202), we get a palindrome (322223).

The spelling of 202021 in words is "two hundred two thousand, twenty-one", and thus it is an iban number.