12011111010020 has 24 divisors (see below), whose sum is σ = 25224120511800. Its totient is φ = 4804294424832.

The previous prime is 12011111009999. The next prime is 12011111010037. The reversal of 12011111010020 is 2001011111021.

It can be written as a sum of positive squares in 4 ways, for example, as 311482307236 + 11699628702784 = 558106^2 + 3420472^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12011111009983 and 12011111010010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8715875 + ... + 9999434.

It is an arithmetic number, because the mean of its divisors is an integer number (1051005021325).

Almost surely, 2^{12011111010020} is an apocalyptic number.

12011111010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011111010020 is an abundant number, since it is smaller than the sum of its proper divisors (13213009501780).

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

12011111010020 is a wasteful number, since it uses less digits than its factorization.

12011111010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18747407 (or 18747405 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12011111010020 its reverse (2001011111021), we get a palindrome (14012122121041).

The spelling of 12011111010020 in words is "twelve trillion, eleven billion, one hundred eleven million, ten thousand, twenty".