12000020001220 has 72 divisors (see below), whose sum is σ = 25462863130824. Its totient is φ = 4750458240000.

The previous prime is 12000020001199. The next prime is 12000020001239. The reversal of 12000020001220 is 2210002000021.

It can be written as a sum of positive squares in 12 ways, for example, as 225180036 + 11999794821184 = 15006^2 + 3464072^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12000020001197 and 12000020001206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 534725200 + ... + 534747640.

It is an arithmetic number, because the mean of its divisors is an integer number (353650876817).

Almost surely, 2^{12000020001220} is an apocalyptic number.

12000020001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12000020001220 is an abundant number, since it is smaller than the sum of its proper divisors (13462843129604).

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

12000020001220 is a wasteful number, since it uses less digits than its factorization.

12000020001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25273 (or 25170 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12000020001220 its reverse (2210002000021), we get a palindrome (14210022001241).

The spelling of 12000020001220 in words is "twelve trillion, twenty million, one thousand, two hundred twenty".