21404232144 has 60 divisors (see below), whose sum is σ = 59972203200. Its totient is φ = 7126396992.

The previous prime is 21404232121. The next prime is 21404232197. The reversal of 21404232144 is 44123240412.

21404232144 is a `hidden beast` number, since 21 + 4 + 0 + 423 + 214 + 4 = 666.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 37177 + ... + 210215.

It is an arithmetic number, because the mean of its divisors is an integer number (999536720).

Almost surely, 2^21404232144 is an apocalyptic number.

21404232144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21404232144 is an abundant number, since it is smaller than the sum of its proper divisors (38567971056).

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

21404232144 is a wasteful number, since it uses less digits than its factorization.

21404232144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173912 (or 173903 counting only the distinct ones).

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

Adding to 21404232144 its reverse (44123240412), we get a palindrome (65527472556).

The spelling of 21404232144 in words is "twenty-one billion, four hundred four million, two hundred thirty-two thousand, one hundred forty-four".