212045 has 4 divisors (see below), whose sum is σ = 254460. Its totient is φ = 169632.

The previous prime is 212039. The next prime is 212057. The reversal of 212045 is 540212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111556 + 100489 = 334^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 212045 - 2⁴ = 212029 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21200 + ... + 21209.

It is an arithmetic number, because the mean of its divisors is an integer number (63615).

2²¹²⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

212045 is a deficient number, since it is larger than the sum of its proper divisors (42415).

212045 is an equidigital number, since it uses as much as digits as its factorization.

212045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42414.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 212045 is about 460.4834416133. The cubic root of 212045 is about 59.6315381931.

Adding to 212045 its reverse (540212), we get a palindrome (752257).

It can be divided in two parts, 2 and 12045, that multiplied together give a triangular number (24090 = T₂₁₉).

The spelling of 212045 in words is "two hundred twelve thousand, forty-five".