12201021220 has 12 divisors (see below), whose sum is σ = 25622144604. Its totient is φ = 4880408480.

The previous prime is 12201021187. The next prime is 12201021229. The reversal of 12201021220 is 2212010221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1274918436 + 10926102784 = 35706^2 + 104528^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12201021220.

It is not an unprimeable number, because it can be changed into a prime (12201021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305025511 + ... + 305025550.

It is an arithmetic number, because the mean of its divisors is an integer number (2135178717).

Almost surely, 2^12201021220 is an apocalyptic number.

12201021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12201021220 is an abundant number, since it is smaller than the sum of its proper divisors (13421123384).

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

12201021220 is a wasteful number, since it uses less digits than its factorization.

12201021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610051070 (or 610051068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12201021220 its reverse (2212010221), we get a palindrome (14413031441).

The spelling of 12201021220 in words is "twelve billion, two hundred one million, twenty-one thousand, two hundred twenty".