21444330403 has 16 divisors (see below), whose sum is σ = 22165954560. Its totient is φ = 20734684000.

The previous prime is 21444330359. The next prime is 21444330431. The reversal of 21444330403 is 30403344412.

It is a cyclic number.

It is not a de Polignac number, because 21444330403 - 2¹⁷ = 21444199331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444330703) 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, 2269098 + ... + 2278528.

It is an arithmetic number, because the mean of its divisors is an integer number (1385372160).

Almost surely, 2^21444330403 is an apocalyptic number.

21444330403 is a deficient number, since it is larger than the sum of its proper divisors (721624157).

21444330403 is a wasteful number, since it uses less digits than its factorization.

21444330403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10058.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21444330403 its reverse (30403344412), we get a palindrome (51847674815).

The spelling of 21444330403 in words is "twenty-one billion, four hundred forty-four million, three hundred thirty thousand, four hundred three".