21344011001 has 4 divisors (see below), whose sum is σ = 21432575604. Its totient is φ = 21255446400.

The previous prime is 21344010977. The next prime is 21344011009. The reversal of 21344011001 is 10011044312.

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 16919765776 + 4424245225 = 130076^2 + 66515^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344011001 - 2⁶ = 21344010937 is a prime.

It is a super-2 number, since 2×21344011001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344011009) 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, 44281940 + ... + 44282421.

It is an arithmetic number, because the mean of its divisors is an integer number (5358143901).

Almost surely, 2^21344011001 is an apocalyptic number.

It is an amenable number.

21344011001 is a deficient number, since it is larger than the sum of its proper divisors (88564603).

21344011001 is an equidigital number, since it uses as much as digits as its factorization.

21344011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88564602.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21344011001 its reverse (10011044312), we get a palindrome (31355055313).

The spelling of 21344011001 in words is "twenty-one billion, three hundred forty-four million, eleven thousand, one".