21134434544 has 40 divisors (see below), whose sum is σ = 43373884608. Its totient is φ = 9941667840.

The previous prime is 21134434537. The next prime is 21134434549. The reversal of 21134434544 is 44543443112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134434549) 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, 738584 + ... + 766664.

Almost surely, 2^21134434544 is an apocalyptic number.

It is an amenable number.

21134434544 is an abundant number, since it is smaller than the sum of its proper divisors (22239450064).

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

21134434544 is a wasteful number, since it uses less digits than its factorization.

21134434544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30873 (or 30867 counting only the distinct ones).

The product of its digits is 92160, while the sum is 35.

Adding to 21134434544 its reverse (44543443112), we get a palindrome (65677877656).

The spelling of 21134434544 in words is "twenty-one billion, one hundred thirty-four million, four hundred thirty-four thousand, five hundred forty-four".