21945219189 has 8 divisors (see below), whose sum is σ = 29263531200. Its totient is φ = 14628526656.

The previous prime is 21945219161. The next prime is 21945219211. The reversal of 21945219189 is 98191254912.

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

It is not a de Polignac number, because 21945219189 - 2¹³ = 21945210997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945209189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372889 + ... + 427710.

It is an arithmetic number, because the mean of its divisors is an integer number (3657941400).

Almost surely, 2^21945219189 is an apocalyptic number.

It is an amenable number.

21945219189 is a deficient number, since it is larger than the sum of its proper divisors (7318312011).

21945219189 is an equidigital number, since it uses as much as digits as its factorization.

21945219189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809739.

The product of its digits is 466560, while the sum is 51.

The spelling of 21945219189 in words is "twenty-one billion, nine hundred forty-five million, two hundred nineteen thousand, one hundred eighty-nine".