212133389 has 4 divisors (see below), whose sum is σ = 228451356. Its totient is φ = 195815424.

The previous prime is 212133373. The next prime is 212133391. The reversal of 212133389 is 983331212.

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 36120100 + 176013289 = 6010^2 + 13267^2 .

It is a cyclic number.

It is not a de Polignac number, because 212133389 - 2⁴ = 212133373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212133329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8158964 + ... + 8158989.

It is an arithmetic number, because the mean of its divisors is an integer number (57112839).

Almost surely, 2^212133389 is an apocalyptic number.

It is an amenable number.

212133389 is a deficient number, since it is larger than the sum of its proper divisors (16317967).

212133389 is a wasteful number, since it uses less digits than its factorization.

212133389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16317966.

The product of its digits is 7776, while the sum is 32.

The square root of 212133389 is about 14564.7996553334. The cubic root of 212133389 is about 596.3982266076.

The spelling of 212133389 in words is "two hundred twelve million, one hundred thirty-three thousand, three hundred eighty-nine".