211630 has 8 divisors (see below), whose sum is σ = 380952. Its totient is φ = 84648.

The previous prime is 211619. The next prime is 211639. The reversal of 211630 is 36112.

211630 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 211630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211639) by changing a digit.

211630 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 10572 + ... + 10591.

It is an arithmetic number, because the mean of its divisors is an integer number (47619).

2²¹¹⁶³⁰ is an apocalyptic number.

211630 is a deficient number, since it is larger than the sum of its proper divisors (169322).

211630 is a wasteful number, since it uses less digits than its factorization.

211630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21170.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 211630 is about 460.0326075399. The cubic root of 211630 is about 59.5926105278.

Adding to 211630 its reverse (36112), we get a palindrome (247742).

It can be divided in two parts, 211 and 630, that added together give a square (841 = 29²).

The spelling of 211630 in words is "two hundred eleven thousand, six hundred thirty".