4243212161 has 2 divisors, whose sum is σ = 4243212162. Its totient is φ = 4243212160.

The previous prime is 4243212097. The next prime is 4243212191. The reversal of 4243212161 is 1612123424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3310276225 + 932935936 = 57535^2 + 30544^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243212161 - 2⁶ = 4243212097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4243212161.

It is not a weakly prime, because it can be changed into another prime (4243212191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121606080 + 2121606081.

It is an arithmetic number, because the mean of its divisors is an integer number (2121606081).

Almost surely, 2^4243212161 is an apocalyptic number.

It is an amenable number.

4243212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243212161 is an equidigital number, since it uses as much as digits as its factorization.

4243212161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 4243212161 is about 65139.9428998829. The cubic root of 4243212161 is about 1618.9430896295.

Adding to 4243212161 its reverse (1612123424), we get a palindrome (5855335585).

The spelling of 4243212161 in words is "four billion, two hundred forty-three million, two hundred twelve thousand, one hundred sixty-one".