12011221566100 has 18 divisors (see below), whose sum is σ = 26064350798654. Its totient is φ = 4804488626400.

The previous prime is 12011221566073. The next prime is 12011221566101. The reversal of 12011221566100 is 166512211021.

It can be written as a sum of positive squares in 3 ways, for example, as 2164064597776 + 9847156968324 = 1471076^2 + 3138018^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011221566101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60056107731 + ... + 60056107930.

Almost surely, 2^{12011221566100} is an apocalyptic number.

12011221566100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011221566100 is an abundant number, since it is smaller than the sum of its proper divisors (14053129232554).

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

12011221566100 is a wasteful number, since it uses less digits than its factorization.

12011221566100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120112215675 (or 120112215668 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 12011221566100 its reverse (166512211021), we get a palindrome (12177733777121).

The spelling of 12011221566100 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-six thousand, one hundred".