211422816 has 108 divisors (see below), whose sum is σ = 660969036. Its totient is φ = 64056960.

The previous prime is 211422811. The next prime is 211422817. The reversal of 211422816 is 618224112.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 211422816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211422811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31815 + ... + 37881.

Almost surely, 2^211422816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211422816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330484518).

211422816 is an abundant number, since it is smaller than the sum of its proper divisors (449546220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211422816 is a wasteful number, since it uses less digits than its factorization.

211422816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105 (or 6083 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 211422816 is about 14540.3856895201. The cubic root of 211422816 is about 595.7315728912.

Adding to 211422816 its reverse (618224112), we get a palindrome (829646928).

The spelling of 211422816 in words is "two hundred eleven million, four hundred twenty-two thousand, eight hundred sixteen".