202121201011997 has 2 divisors, whose sum is σ = 202121201011998. Its totient is φ = 202121201011996.

The previous prime is 202121201011991. The next prime is 202121201012051. The reversal of 202121201011997 is 799110102121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129208370724196 + 72912830287801 = 11366986^2 + 8538901^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121201011997 - 2¹⁰ = 202121201010973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202121201011997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121201011991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060600505998 + 101060600505999.

It is an arithmetic number, because the mean of its divisors is an integer number (101060600505999).

Almost surely, 2^{202121201011997} is an apocalyptic number.

It is an amenable number.

202121201011997 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121201011997 is an equidigital number, since it uses as much as digits as its factorization.

202121201011997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The spelling of 202121201011997 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred one million, eleven thousand, nine hundred ninety-seven".