21175230814 has 4 divisors (see below), whose sum is σ = 31762846224. Its totient is φ = 10587615406.

The previous prime is 21175230809. The next prime is 21175230859. The reversal of 21175230814 is 41803257112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21175230814.

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, 5293807702 + ... + 5293807705.

It is an arithmetic number, because the mean of its divisors is an integer number (7940711556).

Almost surely, 2^21175230814 is an apocalyptic number.

21175230814 is a deficient number, since it is larger than the sum of its proper divisors (10587615410).

21175230814 is a wasteful number, since it uses less digits than its factorization.

21175230814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10587615409.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 21175230814 its reverse (41803257112), we get a palindrome (62978487926).

The spelling of 21175230814 in words is "twenty-one billion, one hundred seventy-five million, two hundred thirty thousand, eight hundred fourteen".