21751404318 has 96 divisors (see below), whose sum is σ = 54268231680. Its totient is φ = 6167819520.

The previous prime is 21751404287. The next prime is 21751404319. The reversal of 21751404318 is 81340415712.

21751404318 is a `hidden beast` number, since 217 + 5 + 1 + 4 + 0 + 431 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751404319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14607318 + ... + 14608806.

It is an arithmetic number, because the mean of its divisors is an integer number (565294080).

Almost surely, 2^21751404318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21751404318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27134115840).

21751404318 is an abundant number, since it is smaller than the sum of its proper divisors (32516827362).

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

21751404318 is a wasteful number, since it uses less digits than its factorization.

21751404318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2299 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21751404318 in words is "twenty-one billion, seven hundred fifty-one million, four hundred four thousand, three hundred eighteen".