12121210201220 has 24 divisors (see below), whose sum is σ = 25463438621208. Its totient is φ = 4846789376000.

The previous prime is 12121210201213. The next prime is 12121210201229. The reversal of 12121210201220 is 2210201212121.

It can be written as a sum of positive squares in 4 ways, for example, as 2834697526336 + 9286512674884 = 1683656^2 + 3047378^2 .

It is not an unprimeable number, because it can be changed into a prime (12121210201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105860381 + ... + 105974820.

It is an arithmetic number, because the mean of its divisors is an integer number (1060976609217).

Almost surely, 2^{12121210201220} is an apocalyptic number.

12121210201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121210201220 is an abundant number, since it is smaller than the sum of its proper divisors (13342228419988).

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

12121210201220 is a wasteful number, since it uses less digits than its factorization.

12121210201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211838071 (or 211838069 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12121210201220 its reverse (2210201212121), we get a palindrome (14331411413341).

The spelling of 12121210201220 in words is "twelve trillion, one hundred twenty-one billion, two hundred ten million, two hundred one thousand, two hundred twenty".