201121100220 has 48 divisors (see below), whose sum is σ = 573764355360. Its totient is φ = 52620362496.

The previous prime is 201121100209. The next prime is 201121100221. The reversal of 201121100220 is 22001121102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 201121100196 and 201121100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121100221) 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, 31619635 + ... + 31625994.

It is an arithmetic number, because the mean of its divisors is an integer number (11953424070).

Almost surely, 2^201121100220 is an apocalyptic number.

201121100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121100220 is an abundant number, since it is smaller than the sum of its proper divisors (372643255140).

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

201121100220 is a wasteful number, since it uses less digits than its factorization.

201121100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63245694 (or 63245692 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201121100220 its reverse (22001121102), we get a palindrome (223122221322).

The spelling of 201121100220 in words is "two hundred one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty".