21749034384 has 160 divisors (see below), whose sum is σ = 77832161280. Its totient is φ = 5649091200.

The previous prime is 21749034311. The next prime is 21749034409. The reversal of 21749034384 is 48343094712.

21749034384 is a `hidden beast` number, since 217 + 4 + 90 + 343 + 8 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293652 + ... + 360179.

It is an arithmetic number, because the mean of its divisors is an integer number (486451008).

Almost surely, 2^21749034384 is an apocalyptic number.

21749034384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21749034384 is an abundant number, since it is smaller than the sum of its proper divisors (56083126896).

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

21749034384 is a wasteful number, since it uses less digits than its factorization.

21749034384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653866 (or 653854 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 21749034384 in words is "twenty-one billion, seven hundred forty-nine million, thirty-four thousand, three hundred eighty-four".