213253345205 has 4 divisors (see below), whose sum is σ = 255904014252. Its totient is φ = 170602676160.

The previous prime is 213253345189. The next prime is 213253345211. The reversal of 213253345205 is 502543352312.

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 54452689201 + 158800656004 = 233351^2 + 398498^2 .

It is not a de Polignac number, because 213253345205 - 2⁴ = 213253345189 is a prime.

It is a super-2 number, since 2×213253345205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 21325334516 + ... + 21325334525.

It is an arithmetic number, because the mean of its divisors is an integer number (63976003563).

Almost surely, 2^213253345205 is an apocalyptic number.

It is an amenable number.

213253345205 is a deficient number, since it is larger than the sum of its proper divisors (42650669047).

213253345205 is an equidigital number, since it uses as much as digits as its factorization.

213253345205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42650669046.

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 213253345205 its reverse (502543352312), we get a palindrome (715796697517).

The spelling of 213253345205 in words is "two hundred thirteen billion, two hundred fifty-three million, three hundred forty-five thousand, two hundred five".