201121110021 has 8 divisors (see below), whose sum is σ = 288789286240. Its totient is φ = 123766836912.

The previous prime is 201121109957. The next prime is 201121110059. The reversal of 201121110021 is 120011121102.

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

It is not a de Polignac number, because 201121110021 - 2⁶ = 201121109957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201121109979 and 201121110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121110121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2578475731 + ... + 2578475808.

It is an arithmetic number, because the mean of its divisors is an integer number (36098660780).

Almost surely, 2^201121110021 is an apocalyptic number.

It is an amenable number.

201121110021 is a deficient number, since it is larger than the sum of its proper divisors (87668176219).

201121110021 is a wasteful number, since it uses less digits than its factorization.

201121110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156951555.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201121110021 its reverse (120011121102), we get a palindrome (321132231123).

The spelling of 201121110021 in words is "two hundred one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".