213242473 has 2 divisors, whose sum is σ = 213242474. Its totient is φ = 213242472.

The previous prime is 213242429. The next prime is 213242489. The reversal of 213242473 is 374242312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 15896169 = 14048^2 + 3987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213242473 is a prime.

It is not a weakly prime, because it can be changed into another prime (213242573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106621236 + 106621237.

It is an arithmetic number, because the mean of its divisors is an integer number (106621237).

Almost surely, 2^213242473 is an apocalyptic number.

It is an amenable number.

213242473 is a deficient number, since it is larger than the sum of its proper divisors (1).

213242473 is an equidigital number, since it uses as much as digits as its factorization.

213242473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 28.

The square root of 213242473 is about 14602.8241446646. The cubic root of 213242473 is about 597.4357912597.

Adding to 213242473 its reverse (374242312), we get a palindrome (587484785).

The spelling of 213242473 in words is "two hundred thirteen million, two hundred forty-two thousand, four hundred seventy-three".