21975824196 has 18 divisors (see below), whose sum is σ = 55550000142. Its totient is φ = 7325274720.

The previous prime is 21975824183. The next prime is 21975824201. The reversal of 21975824196 is 69142857912.

It is a happy number.

21975824196 is a `hidden beast` number, since 2 + 19 + 7 + 582 + 41 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21161520900 + 814303296 = 145470^2 + 28536^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305219745 + ... + 305219816.

It is an arithmetic number, because the mean of its divisors is an integer number (3086111119).

Almost surely, 2^21975824196 is an apocalyptic number.

It is an amenable number.

21975824196 is an abundant number, since it is smaller than the sum of its proper divisors (33574175946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21975824196 is a wasteful number, since it uses less digits than its factorization.

21975824196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610439571 (or 610439566 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 21975824196 in words is "twenty-one billion, nine hundred seventy-five million, eight hundred twenty-four thousand, one hundred ninety-six".