12013021220 has 12 divisors (see below), whose sum is σ = 25227344604. Its totient is φ = 4805208480.

The previous prime is 12013021177. The next prime is 12013021243. The reversal of 12013021220 is 2212031021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4919339044 + 7093682176 = 70138^2 + 84224^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12013021195 and 12013021204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300325511 + ... + 300325550.

It is an arithmetic number, because the mean of its divisors is an integer number (2102278717).

Almost surely, 2^12013021220 is an apocalyptic number.

12013021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12013021220 is an abundant number, since it is smaller than the sum of its proper divisors (13214323384).

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

12013021220 is a wasteful number, since it uses less digits than its factorization.

12013021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600651070 (or 600651068 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12013021220 its reverse (2212031021), we get a palindrome (14225052241).

The spelling of 12013021220 in words is "twelve billion, thirteen million, twenty-one thousand, two hundred twenty".