21440421324 has 36 divisors (see below), whose sum is σ = 61938995664. Its totient is φ = 6125834592.

The previous prime is 21440421323. The next prime is 21440421367. The reversal of 21440421324 is 42312404412.

21440421324 is a `hidden beast` number, since 2 + 1 + 440 + 4 + 213 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21440421323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42540267 + ... + 42540770.

Almost surely, 2^21440421324 is an apocalyptic number.

It is an amenable number.

21440421324 is an abundant number, since it is smaller than the sum of its proper divisors (40498574340).

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

21440421324 is a wasteful number, since it uses less digits than its factorization.

21440421324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85081054 (or 85081049 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21440421324 its reverse (42312404412), we get a palindrome (63752825736).

The spelling of 21440421324 in words is "twenty-one billion, four hundred forty million, four hundred twenty-one thousand, three hundred twenty-four".