202121202197 has 2 divisors, whose sum is σ = 202121202198. Its totient is φ = 202121202196.

The previous prime is 202121202193. The next prime is 202121202259. The reversal of 202121202197 is 791202121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152630081041 + 49491121156 = 390679^2 + 222466^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121202197 - 2² = 202121202193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121202193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060601098 + 101060601099.

It is an arithmetic number, because the mean of its divisors is an integer number (101060601099).

Almost surely, 2^202121202197 is an apocalyptic number.

It is an amenable number.

202121202197 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121202197 is an equidigital number, since it uses as much as digits as its factorization.

202121202197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 202121202197 its reverse (791202121202), we get a palindrome (993323323399).

The spelling of 202121202197 in words is "two hundred two billion, one hundred twenty-one million, two hundred two thousand, one hundred ninety-seven".