221231112001 has 4 divisors (see below), whose sum is σ = 224857851604. Its totient is φ = 217604372400.

The previous prime is 221231111999. The next prime is 221231112007. The reversal of 221231112001 is 100211132122.

221231112001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100211132122 = 2 ⋅50105566061.

It can be written as a sum of positive squares in 2 ways, for example, as 33278515776 + 187952596225 = 182424^2 + 433535^2 .

It is a cyclic number.

It is not a de Polignac number, because 221231112001 - 2¹ = 221231111999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221231112007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813369710 + ... + 1813369831.

It is an arithmetic number, because the mean of its divisors is an integer number (56214462901).

Almost surely, 2^221231112001 is an apocalyptic number.

It is an amenable number.

221231112001 is a deficient number, since it is larger than the sum of its proper divisors (3626739603).

221231112001 is an equidigital number, since it uses as much as digits as its factorization.

221231112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626739602.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221231112001 its reverse (100211132122), we get a palindrome (321442244123).

The spelling of 221231112001 in words is "two hundred twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, one".