212043305 has 8 divisors (see below), whose sum is σ = 254535432. Its totient is φ = 169579008.

The previous prime is 212043283. The next prime is 212043311. The reversal of 212043305 is 503340212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34727449 + 177315856 = 5893^2 + 13316^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212043305 - 2¹² = 212039209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17867 + ... + 27263.

It is an arithmetic number, because the mean of its divisors is an integer number (31816929).

Almost surely, 2^212043305 is an apocalyptic number.

It is an amenable number.

212043305 is a deficient number, since it is larger than the sum of its proper divisors (42492127).

212043305 is an equidigital number, since it uses as much as digits as its factorization.

212043305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13915.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 212043305 is about 14561.7068024322. The cubic root of 212043305 is about 596.3137930271.

Adding to 212043305 its reverse (503340212), we get a palindrome (715383517).

The spelling of 212043305 in words is "two hundred twelve million, forty-three thousand, three hundred five".