21782098189 has 8 divisors (see below), whose sum is σ = 22303999520. Its totient is φ = 21260894256.

The previous prime is 21782098171. The next prime is 21782098193. The reversal of 21782098189 is 98189028712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21782098189 - 2²¹ = 21780001037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21782098109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110862 + ... + 236335.

It is an arithmetic number, because the mean of its divisors is an integer number (2787999940).

Almost surely, 2^21782098189 is an apocalyptic number.

It is an amenable number.

21782098189 is a deficient number, since it is larger than the sum of its proper divisors (521901331).

21782098189 is a wasteful number, since it uses less digits than its factorization.

21782098189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348699.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The spelling of 21782098189 in words is "twenty-one billion, seven hundred eighty-two million, ninety-eight thousand, one hundred eighty-nine".