12000111012221 has 4 divisors (see below), whose sum is σ = 12000124655292. Its totient is φ = 12000097369152.

The previous prime is 12000111012217. The next prime is 12000111012251. The reversal of 12000111012221 is 12221011100021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8860088028100 + 3140022984121 = 2976590^2 + 1772011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000111012221 - 2² = 12000111012217 is a prime.

It is a super-2 number, since 2×12000111012221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000111012196 and 12000111012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000111012251) 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, 5403980 + ... + 7294053.

It is an arithmetic number, because the mean of its divisors is an integer number (3000031163823).

Almost surely, 2^{12000111012221} is an apocalyptic number.

It is an amenable number.

12000111012221 is a deficient number, since it is larger than the sum of its proper divisors (13643071).

12000111012221 is an equidigital number, since it uses as much as digits as its factorization.

12000111012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13643070.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12000111012221 its reverse (12221011100021), we get a palindrome (24221122112242).

The spelling of 12000111012221 in words is "twelve trillion, one hundred eleven million, twelve thousand, two hundred twenty-one".