201121010011001 has 4 divisors (see below), whose sum is σ = 201121039072500. Its totient is φ = 201120980949504.

The previous prime is 201121010010901. The next prime is 201121010011037. The reversal of 201121010011001 is 100110010121102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 45482884810000 + 155638125201001 = 6744100^2 + 12475501^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121010011001 - 2¹⁰ = 201121010009977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121010001001) 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, 2516825 + ... + 20213273.

It is an arithmetic number, because the mean of its divisors is an integer number (50280259768125).

Almost surely, 2^{201121010011001} is an apocalyptic number.

It is an amenable number.

201121010011001 is a deficient number, since it is larger than the sum of its proper divisors (29061499).

201121010011001 is a wasteful number, since it uses less digits than its factorization.

201121010011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29061498.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 201121010011001 its reverse (100110010121102), we get a palindrome (301231020132103).

The spelling of 201121010011001 in words is "two hundred one trillion, one hundred twenty-one billion, ten million, eleven thousand, one".