21404043334 has 8 divisors (see below), whose sum is σ = 32198590728. Its totient is φ = 10671179760.

The previous prime is 21404043293. The next prime is 21404043373. The reversal of 21404043334 is 43334040412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15420087 + ... + 15421474.

It is an arithmetic number, because the mean of its divisors is an integer number (4024823841).

Almost surely, 2^21404043334 is an apocalyptic number.

21404043334 is a deficient number, since it is larger than the sum of its proper divisors (10794547394).

21404043334 is a wasteful number, since it uses less digits than its factorization.

21404043334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30841910.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21404043334 its reverse (43334040412), we get a palindrome (64738083746).

The spelling of 21404043334 in words is "twenty-one billion, four hundred four million, forty-three thousand, three hundred thirty-four".