202021220197 has 2 divisors, whose sum is σ = 202021220198. Its totient is φ = 202021220196.

The previous prime is 202021220171. The next prime is 202021220221. The reversal of 202021220197 is 791022120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136840066561 + 65181153636 = 369919^2 + 255306^2 .

It is a cyclic number.

It is not a de Polignac number, because 202021220197 - 2¹⁵ = 202021187429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202021220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010610098 + 101010610099.

It is an arithmetic number, because the mean of its divisors is an integer number (101010610099).

Almost surely, 2^202021220197 is an apocalyptic number.

It is an amenable number.

202021220197 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021220197 is an equidigital number, since it uses as much as digits as its factorization.

202021220197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 202021220197 its reverse (791022120202), we get a palindrome (993043340399).

The spelling of 202021220197 in words is "two hundred two billion, twenty-one million, two hundred twenty thousand, one hundred ninety-seven".