212255305 has 4 divisors (see below), whose sum is σ = 254706372. Its totient is φ = 169804240.

The previous prime is 212255297. The next prime is 212255341. The reversal of 212255305 is 503552212.

It is a happy number.

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 129299641 + 82955664 = 11371^2 + 9108^2 .

It is not a de Polignac number, because 212255305 - 2³ = 212255297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212255305.

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, 21225526 + ... + 21225535.

It is an arithmetic number, because the mean of its divisors is an integer number (63676593).

Almost surely, 2^212255305 is an apocalyptic number.

It is an amenable number.

212255305 is a deficient number, since it is larger than the sum of its proper divisors (42451067).

212255305 is an equidigital number, since it uses as much as digits as its factorization.

212255305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42451066.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 212255305 is about 14568.9843503245. The cubic root of 212255305 is about 596.5124575037.

The spelling of 212255305 in words is "two hundred twelve million, two hundred fifty-five thousand, three hundred five".