21109131166 has 8 divisors (see below), whose sum is σ = 33526267200. Its totient is φ = 9933708768.

The previous prime is 21109131143. The next prime is 21109131179. The reversal of 21109131166 is 66113190112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310428366 + ... + 310428433.

It is an arithmetic number, because the mean of its divisors is an integer number (4190783400).

Almost surely, 2^21109131166 is an apocalyptic number.

21109131166 is a deficient number, since it is larger than the sum of its proper divisors (12417136034).

21109131166 is a wasteful number, since it uses less digits than its factorization.

21109131166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620856818.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21109131166 in words is "twenty-one billion, one hundred nine million, one hundred thirty-one thousand, one hundred sixty-six".