21668124195 has 24 divisors (see below), whose sum is σ = 38431529136. Its totient is φ = 11287579968.

The previous prime is 21668124173. The next prime is 21668124199. The reversal of 21668124195 is 59142186612.

21668124195 is a `hidden beast` number, since 216 + 6 + 8 + 12 + 419 + 5 = 666.

It is not a de Polignac number, because 21668124195 - 2⁷ = 21668124067 is a prime.

It is a super-2 number, since 2×21668124195² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21668124195.

It is not an unprimeable number, because it can be changed into a prime (21668124199) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5597064 + ... + 5600933.

It is an arithmetic number, because the mean of its divisors is an integer number (1601313714).

Almost surely, 2^21668124195 is an apocalyptic number.

21668124195 is a deficient number, since it is larger than the sum of its proper divisors (16763404941).

21668124195 is a wasteful number, since it uses less digits than its factorization.

21668124195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11198051 (or 11198048 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 21668124195 in words is "twenty-one billion, six hundred sixty-eight million, one hundred twenty-four thousand, one hundred ninety-five".