12021303220 has 12 divisors (see below), whose sum is σ = 25244736804. Its totient is φ = 4808521280.

The previous prime is 12021303209. The next prime is 12021303221. The reversal of 12021303220 is 2230312021.

It can be written as a sum of positive squares in 2 ways, for example, as 5027660836 + 6993642384 = 70906^2 + 83628^2 .

It is a super-2 number, since 2×12021303220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12021303194 and 12021303203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021303221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300532561 + ... + 300532600.

It is an arithmetic number, because the mean of its divisors is an integer number (2103728067).

Almost surely, 2^12021303220 is an apocalyptic number.

12021303220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021303220 is an abundant number, since it is smaller than the sum of its proper divisors (13223433584).

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

12021303220 is a wasteful number, since it uses less digits than its factorization.

12021303220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601065170 (or 601065168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 12021303220 its reverse (2230312021), we get a palindrome (14251615241).

The spelling of 12021303220 in words is "twelve billion, twenty-one million, three hundred three thousand, two hundred twenty".