212139 has 16 divisors (see below), whose sum is σ = 321440. Its totient is φ = 139968.

The previous prime is 212131. The next prime is 212141. The reversal of 212139 is 931212.

It is a happy number.

It is not a de Polignac number, because 212139 - 2³ = 212131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 212139.

It is not an unprimeable number, because it can be changed into a prime (212131) 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 15 ways as a sum of consecutive naturals, for example, 2139 + ... + 2235.

It is an arithmetic number, because the mean of its divisors is an integer number (20090).

2²¹²¹³⁹ is an apocalyptic number.

212139 is a deficient number, since it is larger than the sum of its proper divisors (109301).

212139 is an frugal number, since it uses more digits than its factorization.

212139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 100 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 212139 is about 460.5854969493. The cubic root of 212139 is about 59.6403484873.

It can be divided in two parts, 212 and 139, that added together give a triangular number (351 = T₂₆).

The spelling of 212139 in words is "two hundred twelve thousand, one hundred thirty-nine".