21424302240 has 96 divisors (see below), whose sum is σ = 73621711296. Its totient is φ = 5193768960.

The previous prime is 21424302239. The next prime is 21424302271. The reversal of 21424302240 is 4220342412.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21424302240.

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 15 ways as a sum of consecutive naturals, for example, 2023537 + ... + 2034096.

It is an arithmetic number, because the mean of its divisors is an integer number (766892826).

Almost surely, 2^21424302240 is an apocalyptic number.

21424302240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424302240 is an abundant number, since it is smaller than the sum of its proper divisors (52197409056).

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

21424302240 is a wasteful number, since it uses less digits than its factorization.

21424302240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057662 (or 4057654 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21424302240 its reverse (4220342412), we get a palindrome (25644644652).

The spelling of 21424302240 in words is "twenty-one billion, four hundred twenty-four million, three hundred two thousand, two hundred forty".