201121012220 has 24 divisors (see below), whose sum is σ = 422511306000. Its totient is φ = 80418465792.

The previous prime is 201121012177. The next prime is 201121012229. The reversal of 201121012220 is 22210121102.

It is a junction number, because it is equal to n+sod(n) for n = 201121012195 and 201121012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121012229) 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, 1816070 + ... + 1923629.

It is an arithmetic number, because the mean of its divisors is an integer number (17604637750).

Almost surely, 2^201121012220 is an apocalyptic number.

201121012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121012220 is an abundant number, since it is smaller than the sum of its proper divisors (221390293780).

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

201121012220 is a wasteful number, since it uses less digits than its factorization.

201121012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742397 (or 3742395 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201121012220 its reverse (22210121102), we get a palindrome (223331133322).

The spelling of 201121012220 in words is "two hundred one billion, one hundred twenty-one million, twelve thousand, two hundred twenty".