211642 has 16 divisors (see below), whose sum is σ = 340200. Its totient is φ = 98560.

The previous prime is 211639. The next prime is 211643. The reversal of 211642 is 246112.

It can be written as a sum of positive squares in 4 ways, for example, as 96721 + 114921 = 311^2 + 339^2 .

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (211643) 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, 2334 + ... + 2422.

2²¹¹⁶⁴² is an apocalyptic number.

211642 is a deficient number, since it is larger than the sum of its proper divisors (128558).

211642 is a wasteful number, since it uses less digits than its factorization.

211642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 96, while the sum is 16.

The square root of 211642 is about 460.0456499088. The cubic root of 211642 is about 59.5937368612.

Adding to 211642 its reverse (246112), we get a palindrome (457754).

The spelling of 211642 in words is "two hundred eleven thousand, six hundred forty-two".