212198281 has 4 divisors (see below), whose sum is σ = 212229700. Its totient is φ = 212166864.

The previous prime is 212198263. The next prime is 212198291. The reversal of 212198281 is 182891212.

212198281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 152769600 + 59428681 = 12360^2 + 7709^2 .

It is a cyclic number.

It is not a de Polignac number, because 212198281 - 2⁷ = 212198153 is a prime.

It is a super-2 number, since 2×212198281² = 90056220918709922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212198291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966 + ... + 20623.

It is an arithmetic number, because the mean of its divisors is an integer number (53057425).

Almost surely, 2^212198281 is an apocalyptic number.

It is an amenable number.

212198281 is a deficient number, since it is larger than the sum of its proper divisors (31419).

212198281 is an equidigital number, since it uses as much as digits as its factorization.

212198281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31418.

The product of its digits is 4608, while the sum is 34.

The square root of 212198281 is about 14567.0271847072. The cubic root of 212198281 is about 596.4590335182.

The spelling of 212198281 in words is "two hundred twelve million, one hundred ninety-eight thousand, two hundred eighty-one".