201121110111021 has 16 divisors (see below), whose sum is σ = 269768418816000. Its totient is φ = 133278567708528.

The previous prime is 201121110110993. The next prime is 201121110111041. The reversal of 201121110111021 is 120111011121102.

It is not a de Polignac number, because 201121110111021 - 2⁵ = 201121110110989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121110111041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161500161 + ... + 162740726.

It is an arithmetic number, because the mean of its divisors is an integer number (16860526176000).

Almost surely, 2^{201121110111021} is an apocalyptic number.

It is an amenable number.

201121110111021 is a deficient number, since it is larger than the sum of its proper divisors (68647308704979).

201121110111021 is a wasteful number, since it uses less digits than its factorization.

201121110111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324242128.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 201121110111021 its reverse (120111011121102), we get a palindrome (321232121232123).

The spelling of 201121110111021 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, twenty-one".