21224441424 has 40 divisors (see below), whose sum is σ = 56311698400. Its totient is φ = 6883602048.

The previous prime is 21224441419. The next prime is 21224441437. The reversal of 21224441424 is 42414442212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21224441391 and 21224441400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5973574 + ... + 5977125.

It is an arithmetic number, because the mean of its divisors is an integer number (1407792460).

Almost surely, 2^21224441424 is an apocalyptic number.

21224441424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21224441424 is an abundant number, since it is smaller than the sum of its proper divisors (35087256976).

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

21224441424 is a wasteful number, since it uses less digits than its factorization.

21224441424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11950747 (or 11950741 counting only the distinct ones).

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

Adding to 21224441424 its reverse (42414442212), we get a palindrome (63638883636).

The spelling of 21224441424 in words is "twenty-one billion, two hundred twenty-four million, four hundred forty-one thousand, four hundred twenty-four".