21444140423 has 8 divisors (see below), whose sum is σ = 21472463376. Its totient is φ = 21415838400.

The previous prime is 21444140407. The next prime is 21444140441. The reversal of 21444140423 is 32404144412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21444140423 - 2⁴ = 21444140407 is a prime.

It is a super-3 number, since 3×21444140423³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444140483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3181565 + ... + 3188297.

It is an arithmetic number, because the mean of its divisors is an integer number (2684057922).

Almost surely, 2^21444140423 is an apocalyptic number.

21444140423 is a deficient number, since it is larger than the sum of its proper divisors (28322953).

21444140423 is a wasteful number, since it uses less digits than its factorization.

21444140423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21444140423 its reverse (32404144412), we get a palindrome (53848284835).

The spelling of 21444140423 in words is "twenty-one billion, four hundred forty-four million, one hundred forty thousand, four hundred twenty-three".