21740018817 has 24 divisors (see below), whose sum is σ = 31962083328. Its totient is φ = 13134135520.

The previous prime is 21740018803. The next prime is 21740018843. The reversal of 21740018817 is 71881004712.

It is not a de Polignac number, because 21740018817 - 2¹⁴ = 21740002433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21740018857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20608 + ... + 209534.

It is an arithmetic number, because the mean of its divisors is an integer number (1331753472).

Almost surely, 2^21740018817 is an apocalyptic number.

It is an amenable number.

21740018817 is a deficient number, since it is larger than the sum of its proper divisors (10222064511).

21740018817 is a wasteful number, since it uses less digits than its factorization.

21740018817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189269 (or 189258 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The spelling of 21740018817 in words is "twenty-one billion, seven hundred forty million, eighteen thousand, eight hundred seventeen".