12111001221001 has 4 divisors (see below), whose sum is σ = 12152335696452. Its totient is φ = 12069666745552.

The previous prime is 12111001220999. The next prime is 12111001221037. The reversal of 12111001221001 is 10012210011121.

It is a happy number.

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 6294197862976 + 5816803358025 = 2508824^2 + 2411805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111001221001 - 2¹ = 12111001220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111001221071) 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, 20667237286 + ... + 20667237871.

It is an arithmetic number, because the mean of its divisors is an integer number (3038083924113).

Almost surely, 2^{12111001221001} is an apocalyptic number.

It is an amenable number.

12111001221001 is a deficient number, since it is larger than the sum of its proper divisors (41334475451).

12111001221001 is an equidigital number, since it uses as much as digits as its factorization.

12111001221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41334475450.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12111001221001 its reverse (10012210011121), we get a palindrome (22123211232122).

The spelling of 12111001221001 in words is "twelve trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, one".