211232320 has 56 divisors (see below), whose sum is σ = 541699704. Its totient is φ = 77991936.

The previous prime is 211232279. The next prime is 211232321. The reversal of 211232320 is 23232112.

It can be written as a sum of positive squares in 4 ways, for example, as 21233664 + 189998656 = 4608^2 + 13784^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 211232294 and 211232303.

It is not an unprimeable number, because it can be changed into a prime (211232321) 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 7 ways as a sum of consecutive naturals, for example, 21229 + ... + 29548.

It is an arithmetic number, because the mean of its divisors is an integer number (9673209).

Almost surely, 2^211232320 is an apocalyptic number.

211232320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211232320 is an abundant number, since it is smaller than the sum of its proper divisors (330467384).

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

211232320 is a wasteful number, since it uses less digits than its factorization.

211232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50807 (or 50797 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 211232320 is about 14533.8336305326. The cubic root of 211232320 is about 595.5525972808.

Adding to 211232320 its reverse (23232112), we get a palindrome (234464432).

The spelling of 211232320 in words is "two hundred eleven million, two hundred thirty-two thousand, three hundred twenty".