213394123 has 2 divisors, whose sum is σ = 213394124. Its totient is φ = 213394122.

The previous prime is 213394109. The next prime is 213394127. The reversal of 213394123 is 321493312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213394123 - 2¹⁷ = 213263051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213394091 and 213394100.

It is not a weakly prime, because it can be changed into another prime (213394127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106697061 + 106697062.

It is an arithmetic number, because the mean of its divisors is an integer number (106697062).

Almost surely, 2^213394123 is an apocalyptic number.

213394123 is a deficient number, since it is larger than the sum of its proper divisors (1).

213394123 is an equidigital number, since it uses as much as digits as its factorization.

213394123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 213394123 is about 14608.0157105611. The cubic root of 213394123 is about 597.5773822970.

The spelling of 213394123 in words is "two hundred thirteen million, three hundred ninety-four thousand, one hundred twenty-three".