212021033209 has 4 divisors (see below), whose sum is σ = 216021430116. Its totient is φ = 208020636304.

The previous prime is 212021033183. The next prime is 212021033267. The reversal of 212021033209 is 902330120212.

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 143813875984 + 68207157225 = 379228^2 + 261165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021033209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021033299) 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, 2000198374 + ... + 2000198479.

It is an arithmetic number, because the mean of its divisors is an integer number (54005357529).

Almost surely, 2^212021033209 is an apocalyptic number.

It is an amenable number.

212021033209 is a deficient number, since it is larger than the sum of its proper divisors (4000396907).

212021033209 is an equidigital number, since it uses as much as digits as its factorization.

212021033209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000396906.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 212021033209 in words is "two hundred twelve billion, twenty-one million, thirty-three thousand, two hundred nine".