12021012220 has 72 divisors (see below), whose sum is σ = 30081950640. Its totient is φ = 4020952320.

The previous prime is 12021012193. The next prime is 12021012253. The reversal of 12021012220 is 2221012021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109410 + ... + 189769.

It is an arithmetic number, because the mean of its divisors is an integer number (417804870).

Almost surely, 2^12021012220 is an apocalyptic number.

12021012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021012220 is an abundant number, since it is smaller than the sum of its proper divisors (18060938420).

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

12021012220 is a wasteful number, since it uses less digits than its factorization.

12021012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299243 (or 299234 counting only the distinct ones).

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

Adding to 12021012220 its reverse (2221012021), we get a palindrome (14242024241).

The spelling of 12021012220 in words is "twelve billion, twenty-one million, twelve thousand, two hundred twenty".