21808719514 has 8 divisors (see below), whose sum is σ = 32715062208. Its totient is φ = 10903698780.

The previous prime is 21808719481. The next prime is 21808719529. The reversal of 21808719514 is 41591780812.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288162 + ... + 355885.

It is an arithmetic number, because the mean of its divisors is an integer number (4089382776).

Almost surely, 2^21808719514 is an apocalyptic number.

21808719514 is a deficient number, since it is larger than the sum of its proper divisors (10906342694).

21808719514 is a wasteful number, since it uses less digits than its factorization.

21808719514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660980.

The product of its (nonzero) digits is 161280, while the sum is 46.

The spelling of 21808719514 in words is "twenty-one billion, eight hundred eight million, seven hundred nineteen thousand, five hundred fourteen".