21472184205 has 24 divisors (see below), whose sum is σ = 38501849880. Its totient is φ = 11056940160.

The previous prime is 21472184189. The next prime is 21472184257. The reversal of 21472184205 is 50248127412.

21472184205 is a `hidden beast` number, since 2 + 1 + 472 + 184 + 2 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7283086281 + 14189097924 = 85341^2 + 119118^2 .

It is not a de Polignac number, because 21472184205 - 2⁴ = 21472184189 is a prime.

It is a super-2 number, since 2×21472184205² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21472184205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8225586 + ... + 8228195.

It is an arithmetic number, because the mean of its divisors is an integer number (1604243745).

Almost surely, 2^21472184205 is an apocalyptic number.

It is an amenable number.

21472184205 is a deficient number, since it is larger than the sum of its proper divisors (17029665675).

21472184205 is a wasteful number, since it uses less digits than its factorization.

21472184205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16453821 (or 16453818 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 21472184205 in words is "twenty-one billion, four hundred seventy-two million, one hundred eighty-four thousand, two hundred five".