21275716189 has 32 divisors (see below), whose sum is σ = 27776722176. Its totient is φ = 15814241280.

The previous prime is 21275716093. The next prime is 21275716207. The reversal of 21275716189 is 98161757212.

It is a cyclic number.

It is not a de Polignac number, because 21275716189 - 2²³ = 21267327581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275713189) 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 31 ways as a sum of consecutive naturals, for example, 849334 + ... + 874024.

It is an arithmetic number, because the mean of its divisors is an integer number (868022568).

Almost surely, 2^21275716189 is an apocalyptic number.

It is an amenable number.

21275716189 is a deficient number, since it is larger than the sum of its proper divisors (6501005987).

21275716189 is a wasteful number, since it uses less digits than its factorization.

21275716189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25285.

The product of its digits is 423360, while the sum is 49.

The spelling of 21275716189 in words is "twenty-one billion, two hundred seventy-five million, seven hundred sixteen thousand, one hundred eighty-nine".