213239844841 has 9 divisors (see below), whose sum is σ = 214631851959. Its totient is φ = 211856816736.

The previous prime is 213239844803. The next prime is 213239844859. The reversal of 213239844841 is 148448932312.

The square root of 213239844841 is 461779.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 83708955625 + 129530889216 = 289325^2 + 359904^2 .

It is not a de Polignac number, because 213239844841 - 2⁹ = 213239844329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213239844241) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 75268561 + ... + 75271393.

It is an arithmetic number, because the mean of its divisors is an integer number (23847983551).

Almost surely, 2^213239844841 is an apocalyptic number.

213239844841 is the 461779-th square number.

213239844841 is the 230890-th centered octagonal number.

It is an amenable number.

213239844841 is a deficient number, since it is larger than the sum of its proper divisors (1392007118).

213239844841 is an frugal number, since it uses more digits than its factorization.

213239844841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992 (or 2996 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 49.

Multiplying 213239844841 by its sum of digits (49), we get a square (10448752397209 = 3232453²).

The spelling of 213239844841 in words is "two hundred thirteen billion, two hundred thirty-nine million, eight hundred forty-four thousand, eight hundred forty-one".