21234104442 has 48 divisors (see below), whose sum is σ = 47878871040. Its totient is φ = 6793014816.

The previous prime is 21234104429. The next prime is 21234104449. The reversal of 21234104442 is 24440143212.

21234104442 is a `hidden beast` number, since 212 + 3 + 4 + 1 + 0 + 4 + 442 = 666.

It is not an unprimeable number, because it can be changed into a prime (21234104449) 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 23 ways as a sum of consecutive naturals, for example, 34618 + ... + 208965.

It is an arithmetic number, because the mean of its divisors is an integer number (997476480).

Almost surely, 2^21234104442 is an apocalyptic number.

21234104442 is an abundant number, since it is smaller than the sum of its proper divisors (26644766598).

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

21234104442 is a wasteful number, since it uses less digits than its factorization.

21234104442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243787 (or 243784 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21234104442 its reverse (24440143212), we get a palindrome (45674247654).

The spelling of 21234104442 in words is "twenty-one billion, two hundred thirty-four million, one hundred four thousand, four hundred forty-two".