21113312404 has 6 divisors (see below), whose sum is σ = 36948296714. Its totient is φ = 10556656200.

The previous prime is 21113312357. The next prime is 21113312417. The reversal of 21113312404 is 40421331112.

It can be written as a sum of positive squares in only one way, i.e., 19251562500 + 1861749904 = 138750^2 + 43148^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2639164047 + ... + 2639164054.

Almost surely, 2^21113312404 is an apocalyptic number.

It is an amenable number.

21113312404 is a deficient number, since it is larger than the sum of its proper divisors (15834984310).

21113312404 is a wasteful number, since it uses less digits than its factorization.

21113312404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278328105 (or 5278328103 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21113312404 its reverse (40421331112), we get a palindrome (61534643516).

The spelling of 21113312404 in words is "twenty-one billion, one hundred thirteen million, three hundred twelve thousand, four hundred four".