212328281 has 16 divisors (see below), whose sum is σ = 242085888. Its totient is φ = 184506000.

The previous prime is 212328257. The next prime is 212328289. The reversal of 212328281 is 182823212.

It is a cyclic number.

It is not a de Polignac number, because 212328281 - 2¹⁰ = 212327257 is a prime.

It is a super-2 number, since 2×212328281² = 90166597824829922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212328289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17456 + ... + 27006.

It is an arithmetic number, because the mean of its divisors is an integer number (15130368).

Almost surely, 2^212328281 is an apocalyptic number.

It is an amenable number.

212328281 is a deficient number, since it is larger than the sum of its proper divisors (29757607).

212328281 is a wasteful number, since it uses less digits than its factorization.

212328281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652.

The product of its digits is 3072, while the sum is 29.

The square root of 212328281 is about 14571.4886336297. The cubic root of 212328281 is about 596.5808124583.

The spelling of 212328281 in words is "two hundred twelve million, three hundred twenty-eight thousand, two hundred eighty-one".