21444134424 has 64 divisors (see below), whose sum is σ = 56780144640. Its totient is φ = 6725644800.

The previous prime is 21444134423. The next prime is 21444134431. The reversal of 21444134424 is 42443144412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444134423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240449 + ... + 2249999.

It is an arithmetic number, because the mean of its divisors is an integer number (887189760).

Almost surely, 2^21444134424 is an apocalyptic number.

21444134424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21444134424 is an abundant number, since it is smaller than the sum of its proper divisors (35336010216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444134424 is a wasteful number, since it uses less digits than its factorization.

21444134424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15080 (or 15076 counting only the distinct ones).

The product of its digits is 49152, while the sum is 33.

Adding to 21444134424 its reverse (42443144412), we get a palindrome (63887278836).

It can be divided in two parts, 214441 and 34424, that added together give a triangular number (248865 = T₇₀₅).

The spelling of 21444134424 in words is "twenty-one billion, four hundred forty-four million, one hundred thirty-four thousand, four hundred twenty-four".