21403404334 has 8 divisors (see below), whose sum is σ = 34574730120. Its totient is φ = 9878494296.

The previous prime is 21403404317. The next prime is 21403404359. The reversal of 21403404334 is 43340430412.

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, 411603904 + ... + 411603955.

It is an arithmetic number, because the mean of its divisors is an integer number (4321841265).

Almost surely, 2^21403404334 is an apocalyptic number.

21403404334 is a deficient number, since it is larger than the sum of its proper divisors (13171325786).

21403404334 is a wasteful number, since it uses less digits than its factorization.

21403404334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823207874.

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

Adding to 21403404334 its reverse (43340430412), we get a palindrome (64743834746).

The spelling of 21403404334 in words is "twenty-one billion, four hundred three million, four hundred four thousand, three hundred thirty-four".