21240443134 has 32 divisors (see below), whose sum is σ = 33208341120. Its totient is φ = 10180964352.

The previous prime is 21240443129. The next prime is 21240443137. The reversal of 21240443134 is 43134404212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240443137) 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 15 ways as a sum of consecutive naturals, for example, 3249982 + ... + 3256510.

It is an arithmetic number, because the mean of its divisors is an integer number (1037760660).

Almost surely, 2^21240443134 is an apocalyptic number.

21240443134 is a deficient number, since it is larger than the sum of its proper divisors (11967897986).

21240443134 is a wasteful number, since it uses less digits than its factorization.

21240443134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7284.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21240443134 its reverse (43134404212), we get a palindrome (64374847346).

The spelling of 21240443134 in words is "twenty-one billion, two hundred forty million, four hundred forty-three thousand, one hundred thirty-four".