12132121220 has 12 divisors (see below), whose sum is σ = 25477454604. Its totient is φ = 4852848480.

The previous prime is 12132121187. The next prime is 12132121229. The reversal of 12132121220 is 2212123121.

It can be written as a sum of positive squares in 2 ways, for example, as 1296144004 + 10835977216 = 36002^2 + 104096^2 .

It is not an unprimeable number, because it can be changed into a prime (12132121229) 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, 303303011 + ... + 303303050.

It is an arithmetic number, because the mean of its divisors is an integer number (2123121217).

Almost surely, 2^12132121220 is an apocalyptic number.

12132121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12132121220 is an abundant number, since it is smaller than the sum of its proper divisors (13345333384).

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

12132121220 is a wasteful number, since it uses less digits than its factorization.

12132121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606606070 (or 606606068 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12132121220 its reverse (2212123121), we get a palindrome (14344244341).

The spelling of 12132121220 in words is "twelve billion, one hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty".