213105287 has 2 divisors, whose sum is σ = 213105288. Its totient is φ = 213105286.

The previous prime is 213105271. The next prime is 213105289. The reversal of 213105287 is 782501312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213105287 - 2⁴ = 213105271 is a prime.

Together with 213105289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213105289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106552643 + 106552644.

It is an arithmetic number, because the mean of its divisors is an integer number (106552644).

Almost surely, 2^213105287 is an apocalyptic number.

213105287 is a deficient number, since it is larger than the sum of its proper divisors (1).

213105287 is an equidigital number, since it uses as much as digits as its factorization.

213105287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 213105287 is about 14598.1261468724. The cubic root of 213105287 is about 597.3076469811.

Adding to 213105287 its reverse (782501312), we get a palindrome (995606599).

The spelling of 213105287 in words is "two hundred thirteen million, one hundred five thousand, two hundred eighty-seven".