200121100121211 has 4 divisors (see below), whose sum is σ = 266828133494952. Its totient is φ = 133414066747472.

The previous prime is 200121100121209. The next prime is 200121100121233. The reversal of 200121100121211 is 112121001121002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 200121100121211 - 2¹ = 200121100121209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200121100121911) 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 in 3 ways as a sum of consecutive naturals, for example, 33353516686866 + ... + 33353516686871.

It is an arithmetic number, because the mean of its divisors is an integer number (66707033373738).

Almost surely, 2^{200121100121211} is an apocalyptic number.

200121100121211 is a deficient number, since it is larger than the sum of its proper divisors (66707033373741).

200121100121211 is an equidigital number, since it uses as much as digits as its factorization.

200121100121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66707033373740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 200121100121211 its reverse (112121001121002), we get a palindrome (312242101242213).

The spelling of 200121100121211 in words is "two hundred trillion, one hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred eleven".