201200021220 has 96 divisors (see below), whose sum is σ = 616966471296. Its totient is φ = 48585932800.

The previous prime is 201200021179. The next prime is 201200021221. The reversal of 201200021220 is 22120002102.

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 = 201200021196 and 201200021205.

It is not an unprimeable number, because it can be changed into a prime (201200021221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423471 + ... + 762710.

It is an arithmetic number, because the mean of its divisors is an integer number (6426734076).

Almost surely, 2^201200021220 is an apocalyptic number.

201200021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201200021220 is an abundant number, since it is smaller than the sum of its proper divisors (415766450076).

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

201200021220 is a wasteful number, since it uses less digits than its factorization.

201200021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186461 (or 1186459 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 201200021220 its reverse (22120002102), we get a palindrome (223320023322).

The spelling of 201200021220 in words is "two hundred one billion, two hundred million, twenty-one thousand, two hundred twenty".