201021221200121 has 4 divisors (see below), whose sum is σ = 229738538514432. Its totient is φ = 172303903885812.

The previous prime is 201021221200087. The next prime is 201021221200153. The reversal of 201021221200121 is 121002122120102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201021221200121 - 2⁶ = 201021221200057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021221200121.

It is not an unprimeable number, because it can be changed into a prime (201021221700121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14358658657145 + ... + 14358658657158.

It is an arithmetic number, because the mean of its divisors is an integer number (57434634628608).

Almost surely, 2^{201021221200121} is an apocalyptic number.

It is an amenable number.

201021221200121 is a deficient number, since it is larger than the sum of its proper divisors (28717317314311).

201021221200121 is an equidigital number, since it uses as much as digits as its factorization.

201021221200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28717317314310.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201021221200121 its reverse (121002122120102), we get a palindrome (322023343320223).

The spelling of 201021221200121 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".