212223309491 has 2 divisors, whose sum is σ = 212223309492. Its totient is φ = 212223309490.

The previous prime is 212223309457. The next prime is 212223309497. The reversal of 212223309491 is 194903322212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212223309491 - 2³⁴ = 195043440307 is a prime.

It is not a weakly prime, because it can be changed into another prime (212223309497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111654745 + 106111654746.

It is an arithmetic number, because the mean of its divisors is an integer number (106111654746).

Almost surely, 2^212223309491 is an apocalyptic number.

212223309491 is a deficient number, since it is larger than the sum of its proper divisors (1).

212223309491 is an equidigital number, since it uses as much as digits as its factorization.

212223309491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 212223309491 in words is "two hundred twelve billion, two hundred twenty-three million, three hundred nine thousand, four hundred ninety-one".