21244433423 has 4 divisors (see below), whose sum is σ = 21268493688. Its totient is φ = 21220373160.

The previous prime is 21244433417. The next prime is 21244433429. The reversal of 21244433423 is 32433444212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21244433417) and next prime (21244433429).

It is a cyclic number.

It is not a de Polignac number, because 21244433423 - 2⁶ = 21244433359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21244433423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244433429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12028808 + ... + 12030573.

It is an arithmetic number, because the mean of its divisors is an integer number (5317123422).

Almost surely, 2^21244433423 is an apocalyptic number.

21244433423 is a deficient number, since it is larger than the sum of its proper divisors (24060265).

21244433423 is an equidigital number, since it uses as much as digits as its factorization.

21244433423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24060264.

The product of its digits is 55296, while the sum is 32.

Adding to 21244433423 its reverse (32433444212), we get a palindrome (53677877635).

The spelling of 21244433423 in words is "twenty-one billion, two hundred forty-four million, four hundred thirty-three thousand, four hundred twenty-three".