202022221 has 2 divisors, whose sum is σ = 202022222. Its totient is φ = 202022220.

The previous prime is 202022173. The next prime is 202022251. The reversal of 202022221 is 122220202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121220100 + 80802121 = 11010^2 + 8989^2 .

It is a cyclic number.

It is not a de Polignac number, because 202022221 - 2²¹ = 199925069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202022251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101011110 + 101011111.

It is an arithmetic number, because the mean of its divisors is an integer number (101011111).

Almost surely, 2^202022221 is an apocalyptic number.

It is an amenable number.

202022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202022221 is an equidigital number, since it uses as much as digits as its factorization.

202022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 202022221 is about 14213.4521141066. The cubic root of 202022221 is about 586.7679450594.

Adding to 202022221 its reverse (122220202), we get a palindrome (324242423).

The spelling of 202022221 in words is "two hundred two million, twenty-two thousand, two hundred twenty-one".