211042816 has 20 divisors (see below), whose sum is σ = 421674462. Its totient is φ = 105521152.

The previous prime is 211042813. The next prime is 211042829. The reversal of 211042816 is 618240112.

211042816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 142086400 + 68956416 = 11920^2 + 8304^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (211042813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205585 + ... + 206608.

Almost surely, 2^211042816 is an apocalyptic number.

It is an amenable number.

211042816 is a deficient number, since it is larger than the sum of its proper divisors (210631646).

211042816 is an frugal number, since it uses more digits than its factorization.

211042816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412211 (or 412195 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 211042816 is about 14527.3127590756. The cubic root of 211042816 is about 595.3744468816.

Adding to 211042816 its reverse (618240112), we get a palindrome (829282928).

The spelling of 211042816 in words is "two hundred eleven million, forty-two thousand, eight hundred sixteen".