212330091 has 4 divisors (see below), whose sum is σ = 283106792. Its totient is φ = 141553392.

The previous prime is 212330033. The next prime is 212330101. The reversal of 212330091 is 190033212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212330091 - 2¹⁰ = 212329067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212335091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35388346 + ... + 35388351.

It is an arithmetic number, because the mean of its divisors is an integer number (70776698).

Almost surely, 2^212330091 is an apocalyptic number.

212330091 is a deficient number, since it is larger than the sum of its proper divisors (70776701).

212330091 is an equidigital number, since it uses as much as digits as its factorization.

212330091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70776700.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 212330091 is about 14571.5507410845. The cubic root of 212330091 is about 596.5825076450.

The spelling of 212330091 in words is "two hundred twelve million, three hundred thirty thousand, ninety-one".