213545444436 has 36 divisors (see below), whose sum is σ = 547398188064. Its totient is φ = 70179253200.

The previous prime is 213545444417. The next prime is 213545444447. The reversal of 213545444436 is 634444545312.

213545444436 is a `hidden beast` number, since 2 + 1 + 35 + 4 + 544 + 44 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 213545444391 and 213545444400.

It is a congruent number.

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, 41770810 + ... + 41775921.

It is an arithmetic number, because the mean of its divisors is an integer number (15205505224).

Almost surely, 2^213545444436 is an apocalyptic number.

It is an amenable number.

213545444436 is an abundant number, since it is smaller than the sum of its proper divisors (333852743628).

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

213545444436 is a wasteful number, since it uses less digits than its factorization.

213545444436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83546812 (or 83546807 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 45.

Adding to 213545444436 its reverse (634444545312), we get a palindrome (847989989748).

The spelling of 213545444436 in words is "two hundred thirteen billion, five hundred forty-five million, four hundred forty-four thousand, four hundred thirty-six".