21424100240432 has 20 divisors (see below), whose sum is σ = 41534992397640. Its totient is φ = 10705392524928.

The previous prime is 21424100240359. The next prime is 21424100240441. The reversal of 21424100240432 is 23404200142412.

It is a happy number.

It is a super-2 number, since 2×21424100240432² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21424100240395 and 21424100240404.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 416073158 + ... + 416124645.

It is an arithmetic number, because the mean of its divisors is an integer number (2076749619882).

Almost surely, 2^{21424100240432} is an apocalyptic number.

It is an amenable number.

21424100240432 is a deficient number, since it is larger than the sum of its proper divisors (20110892157208).

21424100240432 is a wasteful number, since it uses less digits than its factorization.

21424100240432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832199420 (or 832199414 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21424100240432 its reverse (23404200142412), we get a palindrome (44828300382844).

The spelling of 21424100240432 in words is "twenty-one trillion, four hundred twenty-four billion, one hundred million, two hundred forty thousand, four hundred thirty-two".