213181723485 has 12 divisors (see below), whose sum is σ = 369514987452. Its totient is φ = 113696919168.

The previous prime is 213181723463. The next prime is 213181723487. The reversal of 213181723485 is 584327181312.

213181723485 is a `hidden beast` number, since 2 + 131 + 8 + 17 + 23 + 485 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23117986116 + 190063737369 = 152046^2 + 435963^2 .

It is not a de Polignac number, because 213181723485 - 2⁹ = 213181722973 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: 4737371633 = 213181723485 / (2 + 1 + 3 + 1 + 8 + 1 + 7 + 2 + 3 + 4 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 213181723485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213181723487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2368685772 + ... + 2368685861.

It is an arithmetic number, because the mean of its divisors is an integer number (30792915621).

Almost surely, 2^213181723485 is an apocalyptic number.

It is an amenable number.

213181723485 is a deficient number, since it is larger than the sum of its proper divisors (156333263967).

213181723485 is a wasteful number, since it uses less digits than its factorization.

213181723485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737371644 (or 4737371641 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 213181723485 in words is "two hundred thirteen billion, one hundred eighty-one million, seven hundred twenty-three thousand, four hundred eighty-five".