12012211020 has 48 divisors (see below), whose sum is σ = 33657120000. Its totient is φ = 3201072576.

The previous prime is 12012211009. The next prime is 12012211021. The reversal of 12012211020 is 2011221021.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12012210987 and 12012211005.

It is not an unprimeable number, because it can be changed into a prime (12012211021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21481 + ... + 156479.

It is an arithmetic number, because the mean of its divisors is an integer number (701190000).

Almost surely, 2^12012211020 is an apocalyptic number.

12012211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012211020 is an abundant number, since it is smaller than the sum of its proper divisors (21644908980).

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

12012211020 is a wasteful number, since it uses less digits than its factorization.

12012211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136494 (or 136492 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12012211020 its reverse (2011221021), we get a palindrome (14023432041).

The spelling of 12012211020 in words is "twelve billion, twelve million, two hundred eleven thousand, twenty".