201121110020 has 24 divisors (see below), whose sum is σ = 444583507200. Its totient is φ = 76214315232.

The previous prime is 201121109957. The next prime is 201121110059. The reversal of 201121110020 is 20011121102.

It is a junction number, because it is equal to n+sod(n) for n = 201121109983 and 201121110010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264632660 + ... + 264633419.

It is an arithmetic number, because the mean of its divisors is an integer number (18524312800).

Almost surely, 2^201121110020 is an apocalyptic number.

201121110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121110020 is an abundant number, since it is smaller than the sum of its proper divisors (243462397180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201121110020 is a wasteful number, since it uses less digits than its factorization.

201121110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529266107 (or 529266105 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201121110020 its reverse (20011121102), we get a palindrome (221132231122).

The spelling of 201121110020 in words is "two hundred one billion, one hundred twenty-one million, one hundred ten thousand, twenty".