21124117166 has 4 divisors (see below), whose sum is σ = 31686175752. Its totient is φ = 10562058582.

The previous prime is 21124117163. The next prime is 21124117187. The reversal of 21124117166 is 66171142112.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124117163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281029290 + ... + 5281029293.

It is an arithmetic number, because the mean of its divisors is an integer number (7921543938).

Almost surely, 2^21124117166 is an apocalyptic number.

21124117166 is a deficient number, since it is larger than the sum of its proper divisors (10562058586).

21124117166 is a wasteful number, since it uses less digits than its factorization.

21124117166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562058585.

The product of its digits is 4032, while the sum is 32.

Adding to 21124117166 its reverse (66171142112), we get a palindrome (87295259278).

The spelling of 21124117166 in words is "twenty-one billion, one hundred twenty-four million, one hundred seventeen thousand, one hundred sixty-six".