21431508814 has 8 divisors (see below), whose sum is σ = 33184271808. Its totient is φ = 10370084880.

The previous prime is 21431508809. The next prime is 21431508821. The reversal of 21431508814 is 41880513412.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172834687 + ... + 172834810.

It is an arithmetic number, because the mean of its divisors is an integer number (4148033976).

Almost surely, 2^21431508814 is an apocalyptic number.

21431508814 is a deficient number, since it is larger than the sum of its proper divisors (11752762994).

21431508814 is a wasteful number, since it uses less digits than its factorization.

21431508814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345669530.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 21431508814 in words is "twenty-one billion, four hundred thirty-one million, five hundred eight thousand, eight hundred fourteen".