201121121110021 has 8 divisors (see below), whose sum is σ = 231374913217664. Its totient is φ = 171247879846800.

The previous prime is 201121121109991. The next prime is 201121121110037. The reversal of 201121121110021 is 120011121121102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201121121110021 - 2⁵ = 201121121109989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121121109977 and 201121121110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121121110421) 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 7 ways as a sum of consecutive naturals, for example, 95137709970 + ... + 95137712083.

It is an arithmetic number, because the mean of its divisors is an integer number (28921864152208).

Almost surely, 2^{201121121110021} is an apocalyptic number.

It is an amenable number.

201121121110021 is a deficient number, since it is larger than the sum of its proper divisors (30253792107643).

201121121110021 is a wasteful number, since it uses less digits than its factorization.

201121121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190275422211.

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

Adding to 201121121110021 its reverse (120011121121102), we get a palindrome (321132242231123).

The spelling of 201121121110021 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".