213112320205 has 4 divisors (see below), whose sum is σ = 255734784252. Its totient is φ = 170489856160.

The previous prime is 213112320203. The next prime is 213112320241. The reversal of 213112320205 is 502023211312.

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 97677501156 + 115434819049 = 312534^2 + 339757^2 .

It is not a de Polignac number, because 213112320205 - 2¹ = 213112320203 is a prime.

It is a super-2 number, since 2×213112320205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112320203) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21311232016 + ... + 21311232025.

It is an arithmetic number, because the mean of its divisors is an integer number (63933696063).

Almost surely, 2^213112320205 is an apocalyptic number.

It is an amenable number.

213112320205 is a deficient number, since it is larger than the sum of its proper divisors (42622464047).

213112320205 is an equidigital number, since it uses as much as digits as its factorization.

213112320205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42622464046.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 213112320205 its reverse (502023211312), we get a palindrome (715135531517).

The spelling of 213112320205 in words is "two hundred thirteen billion, one hundred twelve million, three hundred twenty thousand, two hundred five".