21444001313 has 16 divisors (see below), whose sum is σ = 24824448000. Its totient is φ = 18144067392.

The previous prime is 21444001303. The next prime is 21444001351. The reversal of 21444001313 is 31310044412.

It is a cyclic number.

It is not a de Polignac number, because 21444001313 - 2¹⁰ = 21444000289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444001303) 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 15 ways as a sum of consecutive naturals, for example, 153008 + ... + 257486.

It is an arithmetic number, because the mean of its divisors is an integer number (1551528000).

Almost surely, 2^21444001313 is an apocalyptic number.

It is an amenable number.

21444001313 is a deficient number, since it is larger than the sum of its proper divisors (3380446687).

21444001313 is a wasteful number, since it uses less digits than its factorization.

21444001313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104864.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21444001313 its reverse (31310044412), we get a palindrome (52754045725).

The spelling of 21444001313 in words is "twenty-one billion, four hundred forty-four million, one thousand, three hundred thirteen".