21836188689 has 16 divisors (see below), whose sum is σ = 33277782912. Its totient is φ = 12476475648.

The previous prime is 21836188681. The next prime is 21836188709. The reversal of 21836188689 is 98688163812.

It is not a de Polignac number, because 21836188689 - 2³ = 21836188681 is a prime.

It is a super-2 number, since 2×21836188689² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21836188681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163047 + ... + 265059.

It is an arithmetic number, because the mean of its divisors is an integer number (2079861432).

Almost surely, 2^21836188689 is an apocalyptic number.

It is an amenable number.

21836188689 is a deficient number, since it is larger than the sum of its proper divisors (11441594223).

21836188689 is a wasteful number, since it uses less digits than its factorization.

21836188689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112216.

The product of its digits is 7962624, while the sum is 60.

The spelling of 21836188689 in words is "twenty-one billion, eight hundred thirty-six million, one hundred eighty-eight thousand, six hundred eighty-nine".