201121220110020 has 96 divisors (see below), whose sum is σ = 643612110640128. Its totient is φ = 45968835576192.

The previous prime is 201121220109893. The next prime is 201121220110061. The reversal of 201121220110020 is 20011022121102.

It is a super-2 number, since 2×201121220110020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2191339 + ... + 20175341.

It is an arithmetic number, because the mean of its divisors is an integer number (6704292819168).

Almost surely, 2^{201121220110020} is an apocalyptic number.

201121220110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121220110020 is an abundant number, since it is smaller than the sum of its proper divisors (442490890530108).

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

201121220110020 is a wasteful number, since it uses less digits than its factorization.

201121220110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18010649 (or 18010647 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201121220110020 its reverse (20011022121102), we get a palindrome (221132242231122).

The spelling of 201121220110020 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred ten thousand, twenty".