21404403334 has 8 divisors (see below), whose sum is σ = 32115581568. Its totient is φ = 10699209480.

The previous prime is 21404403289. The next prime is 21404403353. The reversal of 21404403334 is 43330440412.

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, 1487142 + ... + 1501465.

It is an arithmetic number, because the mean of its divisors is an integer number (4014447696).

Almost surely, 2^21404403334 is an apocalyptic number.

21404403334 is a deficient number, since it is larger than the sum of its proper divisors (10711178234).

21404403334 is a wasteful number, since it uses less digits than its factorization.

21404403334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992190.

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

Adding to 21404403334 its reverse (43330440412), we get a palindrome (64734843746).

The spelling of 21404403334 in words is "twenty-one billion, four hundred four million, four hundred three thousand, three hundred thirty-four".