213203173243 has 2 divisors, whose sum is σ = 213203173244. Its totient is φ = 213203173242.

The previous prime is 213203173241. The next prime is 213203173279. The reversal of 213203173243 is 342371302312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213203173243 - 2¹ = 213203173241 is a prime.

It is a super-2 number, since 2×213203173243² (a number of 23 digits) contains 22 as substring.

Together with 213203173241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213203173241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106601586621 + 106601586622.

It is an arithmetic number, because the mean of its divisors is an integer number (106601586622).

Almost surely, 2^213203173243 is an apocalyptic number.

213203173243 is a deficient number, since it is larger than the sum of its proper divisors (1).

213203173243 is an equidigital number, since it uses as much as digits as its factorization.

213203173243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 31.

Adding to 213203173243 its reverse (342371302312), we get a palindrome (555574475555).

The spelling of 213203173243 in words is "two hundred thirteen billion, two hundred three million, one hundred seventy-three thousand, two hundred forty-three".