21168158188 has 12 divisors (see below), whose sum is σ = 37206043840. Its totient is φ = 10537859952.

The previous prime is 21168158177. The next prime is 21168158227. The reversal of 21168158188 is 88185186112.

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, 11553756 + ... + 11555587.

Almost surely, 2^21168158188 is an apocalyptic number.

It is an amenable number.

21168158188 is a deficient number, since it is larger than the sum of its proper divisors (16037885652).

21168158188 is a wasteful number, since it uses less digits than its factorization.

21168158188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23109576 (or 23109574 counting only the distinct ones).

The product of its digits is 245760, while the sum is 49.

The spelling of 21168158188 in words is "twenty-one billion, one hundred sixty-eight million, one hundred fifty-eight thousand, one hundred eighty-eight".