21344001121 has 4 divisors (see below), whose sum is σ = 21636384772. Its totient is φ = 21051617472.

The previous prime is 21344001103. The next prime is 21344001163. The reversal of 21344001121 is 12110044312.

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 6152206096 + 15191795025 = 78436^2 + 123255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344001121 - 2⁵ = 21344001089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344001181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146191716 + ... + 146191861.

It is an arithmetic number, because the mean of its divisors is an integer number (5409096193).

Almost surely, 2^21344001121 is an apocalyptic number.

It is an amenable number.

21344001121 is a deficient number, since it is larger than the sum of its proper divisors (292383651).

21344001121 is an equidigital number, since it uses as much as digits as its factorization.

21344001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292383650.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21344001121 its reverse (12110044312), we get a palindrome (33454045433).

The spelling of 21344001121 in words is "twenty-one billion, three hundred forty-four million, one thousand, one hundred twenty-one".