202022021 has 2 divisors, whose sum is σ = 202022022. Its totient is φ = 202022020.

The previous prime is 202022011. The next prime is 202022053. The reversal of 202022021 is 120220202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151413025 + 50608996 = 12305^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202022021 - 2⁶ = 202021957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202021993 and 202022011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101011010 + 101011011.

It is an arithmetic number, because the mean of its divisors is an integer number (101011011).

Almost surely, 2^202022021 is an apocalyptic number.

It is an amenable number.

202022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202022021 is an equidigital number, since it uses as much as digits as its factorization.

202022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 202022021 is about 14213.4450785163. The cubic root of 202022021 is about 586.7677514279.

Adding to 202022021 its reverse (120220202), we get a palindrome (322242223).

The spelling of 202022021 in words is "two hundred two million, twenty-two thousand, twenty-one".