200121220211491 has 2 divisors, whose sum is σ = 200121220211492. Its totient is φ = 200121220211490.

The previous prime is 200121220211443. The next prime is 200121220211567. The reversal of 200121220211491 is 194112022121002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200121220211491 - 2¹⁹ = 200121219687203 is a prime.

It is not a weakly prime, because it can be changed into another prime (200121220241491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060610105745 + 100060610105746.

It is an arithmetic number, because the mean of its divisors is an integer number (100060610105746).

Almost surely, 2^{200121220211491} is an apocalyptic number.

200121220211491 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121220211491 is an equidigital number, since it uses as much as digits as its factorization.

200121220211491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 200121220211491 its reverse (194112022121002), we get a palindrome (394233242332493).

The spelling of 200121220211491 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, four hundred ninety-one".