21745857314808 has 72 divisors (see below), whose sum is σ = 64735859697600. Its totient is φ = 6589653729120.

The previous prime is 21745857314803. The next prime is 21745857314821. The reversal of 21745857314808 is 80841375854712.

21745857314808 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 5 + 85 + 73 + 1 + 480 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745857314803) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1248031768 + ... + 1248049191.

Almost surely, 2^{21745857314808} is an apocalyptic number.

It is an amenable number.

21745857314808 is an abundant number, since it is smaller than the sum of its proper divisors (42990002382792).

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

21745857314808 is a wasteful number, since it uses less digits than its factorization.

21745857314808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496080993 (or 2496080975 counting only the distinct ones).

The product of its (nonzero) digits is 60211200, while the sum is 63.

The spelling of 21745857314808 in words is "twenty-one trillion, seven hundred forty-five billion, eight hundred fifty-seven million, three hundred fourteen thousand, eight hundred eight".