12011221111001 has 24 divisors (see below), whose sum is σ = 14088635706816. Its totient is φ = 10209673524960.

The previous prime is 12011221110953. The next prime is 12011221111007. The reversal of 12011221111001 is 10011112211021.

It is not a de Polignac number, because 12011221111001 - 2¹⁴ = 12011221094617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12011221111007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8641715 + ... + 9934871.

It is an arithmetic number, because the mean of its divisors is an integer number (587026487784).

Almost surely, 2^{12011221111001} is an apocalyptic number.

It is an amenable number.

12011221111001 is a deficient number, since it is larger than the sum of its proper divisors (2077414595815).

12011221111001 is a wasteful number, since it uses less digits than its factorization.

12011221111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294749 (or 1294742 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12011221111001 its reverse (10011112211021), we get a palindrome (22022333322022).

The spelling of 12011221111001 in words is "twelve trillion, eleven billion, two hundred twenty-one million, one hundred eleven thousand, one".