21463472385 has 12 divisors (see below), whose sum is σ = 37203352212. Its totient is φ = 11447185248.

The previous prime is 21463472369. The next prime is 21463472423. The reversal of 21463472385 is 58327436412.

21463472385 is a `hidden beast` number, since 2 + 1 + 4 + 634 + 7 + 2 + 3 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10303874064 + 11159598321 = 101508^2 + 105639^2 .

It is not a de Polignac number, because 21463472385 - 2⁴ = 21463472369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 476966053 = 21463472385 / (2 + 1 + 4 + 6 + 3 + 4 + 7 + 2 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 21463472385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238482982 + ... + 238483071.

It is an arithmetic number, because the mean of its divisors is an integer number (3100279351).

Almost surely, 2^21463472385 is an apocalyptic number.

It is an amenable number.

21463472385 is a deficient number, since it is larger than the sum of its proper divisors (15739879827).

21463472385 is a wasteful number, since it uses less digits than its factorization.

21463472385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476966064 (or 476966061 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The spelling of 21463472385 in words is "twenty-one billion, four hundred sixty-three million, four hundred seventy-two thousand, three hundred eighty-five".