21424455135 has 48 divisors (see below), whose sum is σ = 38848118400. Its totient is φ = 10908344832.

The previous prime is 21424455131. The next prime is 21424455161. The reversal of 21424455135 is 53155442412.

21424455135 is a `hidden beast` number, since 21 + 42 + 44 + 551 + 3 + 5 = 666.

It is not a de Polignac number, because 21424455135 - 2² = 21424455131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21424455135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424455131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23914 + ... + 208376.

It is an arithmetic number, because the mean of its divisors is an integer number (809335800).

Almost surely, 2^21424455135 is an apocalyptic number.

21424455135 is a deficient number, since it is larger than the sum of its proper divisors (17423663265).

21424455135 is a wasteful number, since it uses less digits than its factorization.

21424455135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184592 (or 184589 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 21424455135 its reverse (53155442412), we get a palindrome (74579897547).

The spelling of 21424455135 in words is "twenty-one billion, four hundred twenty-four million, four hundred fifty-five thousand, one hundred thirty-five".