200121012021101 has 4 divisors (see below), whose sum is σ = 200467842198492. Its totient is φ = 199774181843712.

The previous prime is 200121012021089. The next prime is 200121012021103. The reversal of 200121012021101 is 101120210121002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 199744543876201 + 376468144900 = 14133101^2 + 613570^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121012021101 - 2³⁸ = 199846134114157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121012021103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173415087830 + ... + 173415088983.

It is an arithmetic number, because the mean of its divisors is an integer number (50116960549623).

Almost surely, 2^{200121012021101} is an apocalyptic number.

It is an amenable number.

200121012021101 is a deficient number, since it is larger than the sum of its proper divisors (346830177391).

200121012021101 is an equidigital number, since it uses as much as digits as its factorization.

200121012021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346830177390.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 200121012021101 its reverse (101120210121002), we get a palindrome (301241222142103).

The spelling of 200121012021101 in words is "two hundred trillion, one hundred twenty-one billion, twelve million, twenty-one thousand, one hundred one".