21444140424 has 32 divisors (see below), whose sum is σ = 61268973120. Its totient is φ = 6126897216.

The previous prime is 21444140407. The next prime is 21444140441. The reversal of 21444140424 is 42404144412.

It is an interprime number because it is at equal distance from previous prime (21444140407) and next prime (21444140441).

It is a super-3 number, since 3×21444140424³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21444140391 and 21444140400.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 63821679 + ... + 63822014.

It is an arithmetic number, because the mean of its divisors is an integer number (1914655410).

Almost surely, 2^21444140424 is an apocalyptic number.

21444140424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21444140424 is an abundant number, since it is smaller than the sum of its proper divisors (39824832696).

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

21444140424 is a wasteful number, since it uses less digits than its factorization.

21444140424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127643709 (or 127643705 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 21444140424 its reverse (42404144412), we get a palindrome (63848284836).

The spelling of 21444140424 in words is "twenty-one billion, four hundred forty-four million, one hundred forty thousand, four hundred twenty-four".