21271810834 has 8 divisors (see below), whose sum is σ = 31911760188. Its totient is φ = 10634557440.

The previous prime is 21271810817. The next prime is 21271810913. The reversal of 21271810834 is 43801817212.

21271810834 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21078684225 + 193126609 = 145185^2 + 13897^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21271810793 and 21271810802.

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 in 3 ways as a sum of consecutive naturals, for example, 654147 + ... + 685894.

Almost surely, 2^21271810834 is an apocalyptic number.

21271810834 is a deficient number, since it is larger than the sum of its proper divisors (10639949354).

21271810834 is a wasteful number, since it uses less digits than its factorization.

21271810834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347980.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 21271810834 in words is "twenty-one billion, two hundred seventy-one million, eight hundred ten thousand, eight hundred thirty-four".