21133544234 has 16 divisors (see below), whose sum is σ = 34802437536. Its totient is φ = 9544969200.

The previous prime is 21133544233. The next prime is 21133544251. The reversal of 21133544234 is 43244533112.

It is a self number, because there is not a number n which added to its sum of digits gives 21133544234.

It is not an unprimeable number, because it can be changed into a prime (21133544233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3055832 + ... + 3062739.

It is an arithmetic number, because the mean of its divisors is an integer number (2175152346).

Almost surely, 2^21133544234 is an apocalyptic number.

21133544234 is a deficient number, since it is larger than the sum of its proper divisors (13668893302).

21133544234 is a wasteful number, since it uses less digits than its factorization.

21133544234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118741.

The product of its digits is 34560, while the sum is 32.

The spelling of 21133544234 in words is "twenty-one billion, one hundred thirty-three million, five hundred forty-four thousand, two hundred thirty-four".