211320330 has 64 divisors (see below), whose sum is σ = 548166528. Its totient is φ = 51828480.

The previous prime is 211320313. The next prime is 211320331. The reversal of 211320330 is 33023112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (211320331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128272 + ... + 129908.

It is an arithmetic number, because the mean of its divisors is an integer number (8565102).

Almost surely, 2^211320330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211320330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274083264).

211320330 is an abundant number, since it is smaller than the sum of its proper divisors (336846198).

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

211320330 is a wasteful number, since it uses less digits than its factorization.

211320330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 211320330 is about 14536.8610779632. The cubic root of 211320330 is about 595.6352981765.

Adding to 211320330 its reverse (33023112), we get a palindrome (244343442).

The spelling of 211320330 in words is "two hundred eleven million, three hundred twenty thousand, three hundred thirty".