21424343234 has 16 divisors (see below), whose sum is σ = 36729340800. Its totient is φ = 9181387584.

The previous prime is 21424343233. The next prime is 21424343251. The reversal of 21424343234 is 43234342412.

It is a self number, because there is not a number n which added to its sum of digits gives 21424343234.

It is not an unprimeable number, because it can be changed into a prime (21424343231) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 455387 + ... + 500225.

It is an arithmetic number, because the mean of its divisors is an integer number (2295583800).

Almost surely, 2^21424343234 is an apocalyptic number.

21424343234 is a deficient number, since it is larger than the sum of its proper divisors (15304997566).

21424343234 is a wasteful number, since it uses less digits than its factorization.

21424343234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78977.

The product of its digits is 55296, while the sum is 32.

Adding to 21424343234 its reverse (43234342412), we get a palindrome (64658685646).

The spelling of 21424343234 in words is "twenty-one billion, four hundred twenty-four million, three hundred forty-three thousand, two hundred thirty-four".