211442 has 16 divisors (see below), whose sum is σ = 395712. Its totient is φ = 82320.

The previous prime is 211441. The next prime is 211457. The reversal of 211442 is 244112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 211442.

It is not an unprimeable number, because it can be changed into a prime (211441) 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, 533 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (24732).

2²¹¹⁴⁴² is an apocalyptic number.

211442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211442 is a deficient number, since it is larger than the sum of its proper divisors (184270).

211442 is a wasteful number, since it uses less digits than its factorization.

211442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its digits is 64, while the sum is 14.

The square root of 211442 is about 459.8282287985. The cubic root of 211442 is about 59.5749590765.

Adding to 211442 its reverse (244112), we get a palindrome (455554).

It can be divided in two parts, 2114 and 42, that multiplied together give a palindrome (88788).

The spelling of 211442 in words is "two hundred eleven thousand, four hundred forty-two", and thus it is an iban number.