212330991 has 4 divisors (see below), whose sum is σ = 283107992. Its totient is φ = 141553992.

The previous prime is 212330983. The next prime is 212330999. The reversal of 212330991 is 199033212.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (212330983) and next prime (212330999).

It is not a de Polignac number, because 212330991 - 2³ = 212330983 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 (212330999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35388496 + ... + 35388501.

It is an arithmetic number, because the mean of its divisors is an integer number (70776998).

Almost surely, 2^212330991 is an apocalyptic number.

212330991 is a deficient number, since it is larger than the sum of its proper divisors (70777001).

212330991 is an equidigital number, since it uses as much as digits as its factorization.

212330991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70777000.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 212330991 is about 14571.5816231458. The cubic root of 212330991 is about 596.5833505519.

The spelling of 212330991 in words is "two hundred twelve million, three hundred thirty thousand, nine hundred ninety-one".