201121000101001 has 4 divisors (see below), whose sum is σ = 201121055776512. Its totient is φ = 201120944425492.

The previous prime is 201121000100989. The next prime is 201121000101011. The reversal of 201121000101001 is 100101000121102.

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 a de Polignac number, because none of the positive numbers 2^k-201121000101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121000101011) 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, 22012921 + ... + 29779366.

It is an arithmetic number, because the mean of its divisors is an integer number (50280263944128).

Almost surely, 2^{201121000101001} is an apocalyptic number.

It is an amenable number.

201121000101001 is a deficient number, since it is larger than the sum of its proper divisors (55675511).

201121000101001 is an equidigital number, since it uses as much as digits as its factorization.

201121000101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55675510.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 201121000101001 its reverse (100101000121102), we get a palindrome (301222000222103).

The spelling of 201121000101001 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred one thousand, one".