21319625718 has 12 divisors (see below), whose sum is σ = 46192522428. Its totient is φ = 7106541900.

The previous prime is 21319625713. The next prime is 21319625731. The reversal of 21319625718 is 81752691312.

21319625718 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 9 + 625 + 7 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319625713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592211808 + ... + 592211843.

It is an arithmetic number, because the mean of its divisors is an integer number (3849376869).

Almost surely, 2^21319625718 is an apocalyptic number.

21319625718 is an abundant number, since it is smaller than the sum of its proper divisors (24872896710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21319625718 is a wasteful number, since it uses less digits than its factorization.

21319625718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184423659 (or 1184423656 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 21319625718 in words is "twenty-one billion, three hundred nineteen million, six hundred twenty-five thousand, seven hundred eighteen".