212322991 has 2 divisors, whose sum is σ = 212322992. Its totient is φ = 212322990.

The previous prime is 212322961. The next prime is 212323031. The reversal of 212322991 is 199223212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212322991 - 2¹³ = 212314799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212322931) 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 as a sum of consecutive naturals, namely, 106161495 + 106161496.

It is an arithmetic number, because the mean of its divisors is an integer number (106161496).

Almost surely, 2^212322991 is an apocalyptic number.

212322991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212322991 is an equidigital number, since it uses as much as digits as its factorization.

212322991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 212322991 is about 14571.3071136395. The cubic root of 212322991 is about 596.5758579626.

The spelling of 212322991 in words is "two hundred twelve million, three hundred twenty-two thousand, nine hundred ninety-one".