21842207189 has 12 divisors (see below), whose sum is σ = 25420636332. Its totient is φ = 18688517760.

The previous prime is 21842207183. The next prime is 21842207221. The reversal of 21842207189 is 98170224812.

It can be written as a sum of positive squares in 2 ways, for example, as 16839474289 + 5002732900 = 129767^2 + 70730^2 .

It is not a de Polignac number, because 21842207189 - 2²⁰ = 21841158613 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842207183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5307182 + ... + 5311295.

It is an arithmetic number, because the mean of its divisors is an integer number (2118386361).

Almost surely, 2^21842207189 is an apocalyptic number.

It is an amenable number.

21842207189 is a deficient number, since it is larger than the sum of its proper divisors (3578429143).

21842207189 is a wasteful number, since it uses less digits than its factorization.

21842207189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10618516 (or 10618505 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 21842207189 in words is "twenty-one billion, eight hundred forty-two million, two hundred seven thousand, one hundred eighty-nine".