213502544305 has 4 divisors (see below), whose sum is σ = 256203053172. Its totient is φ = 170802035440.

The previous prime is 213502544287. The next prime is 213502544347. The reversal of 213502544305 is 503445205312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64154304369 + 149348239936 = 253287^2 + 386456^2 .

It is not a de Polignac number, because 213502544305 - 2⁵ = 213502544273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21350254426 + ... + 21350254435.

It is an arithmetic number, because the mean of its divisors is an integer number (64050763293).

Almost surely, 2^213502544305 is an apocalyptic number.

It is an amenable number.

213502544305 is a deficient number, since it is larger than the sum of its proper divisors (42700508867).

213502544305 is an equidigital number, since it uses as much as digits as its factorization.

213502544305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42700508866.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 213502544305 its reverse (503445205312), we get a palindrome (716947749617).

The spelling of 213502544305 in words is "two hundred thirteen billion, five hundred two million, five hundred forty-four thousand, three hundred five".