200221101121997 has 2 divisors, whose sum is σ = 200221101121998. Its totient is φ = 200221101121996.

The previous prime is 200221101121931. The next prime is 200221101122023. The reversal of 200221101121997 is 799121101122002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118898328210601 + 81322772911396 = 10904051^2 + 9017914^2 .

It is a cyclic number.

It is not a de Polignac number, because 200221101121997 - 2¹⁸ = 200221100859853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200221101121997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200221101121597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100110550560998 + 100110550560999.

It is an arithmetic number, because the mean of its divisors is an integer number (100110550560999).

Almost surely, 2^{200221101121997} is an apocalyptic number.

It is an amenable number.

200221101121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

200221101121997 is an equidigital number, since it uses as much as digits as its factorization.

200221101121997 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.

Adding to 200221101121997 its reverse (799121101122002), we get a palindrome (999342202243999).

The spelling of 200221101121997 in words is "two hundred trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, nine hundred ninety-seven".