12012201020 has 96 divisors (see below), whose sum is σ = 27042398208. Its totient is φ = 4466230272.

The previous prime is 12012201001. The next prime is 12012201023. The reversal of 12012201020 is 2010221021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12012200992 and 12012201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012201023) 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, 12219449 + ... + 12220431.

It is an arithmetic number, because the mean of its divisors is an integer number (281691648).

Almost surely, 2^12012201020 is an apocalyptic number.

12012201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12012201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13521199104).

12012201020 is an abundant number, since it is smaller than the sum of its proper divisors (15030197188).

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

12012201020 is a wasteful number, since it uses less digits than its factorization.

12012201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1417 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12012201020 its reverse (2010221021), we get a palindrome (14022422041).

The spelling of 12012201020 in words is "twelve billion, twelve million, two hundred one thousand, twenty".