212140289 has 4 divisors (see below), whose sum is σ = 212217300. Its totient is φ = 212063280.

The previous prime is 212140237. The next prime is 212140303. The reversal of 212140289 is 982041212.

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 124099600 + 88040689 = 11140^2 + 9383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212140289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212140189) 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, 34214 + ... + 39935.

It is an arithmetic number, because the mean of its divisors is an integer number (53054325).

Almost surely, 2^212140289 is an apocalyptic number.

It is an amenable number.

212140289 is a deficient number, since it is larger than the sum of its proper divisors (77011).

212140289 is an equidigital number, since it uses as much as digits as its factorization.

212140289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77010.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 212140289 is about 14565.0365258725. The cubic root of 212140289 is about 596.4046928270.

The spelling of 212140289 in words is "two hundred twelve million, one hundred forty thousand, two hundred eighty-nine".