213444043391 has 2 divisors, whose sum is σ = 213444043392. Its totient is φ = 213444043390.

The previous prime is 213444043327. The next prime is 213444043457. The reversal of 213444043391 is 193340444312.

213444043391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213444043391 - 2⁶ = 213444043327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213444043321) 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 as a sum of consecutive naturals, namely, 106722021695 + 106722021696.

It is an arithmetic number, because the mean of its divisors is an integer number (106722021696).

Almost surely, 2^213444043391 is an apocalyptic number.

213444043391 is a deficient number, since it is larger than the sum of its proper divisors (1).

213444043391 is an equidigital number, since it uses as much as digits as its factorization.

213444043391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 213444043391 in words is "two hundred thirteen billion, four hundred forty-four million, forty-three thousand, three hundred ninety-one".