212261742437207 has 4 divisors (see below), whose sum is σ = 212348699318976. Its totient is φ = 212174785555440.

The previous prime is 212261742437189. The next prime is 212261742437287. The reversal of 212261742437207 is 702734247162212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212261742437207 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 (212261742437287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43478437223 + ... + 43478442104.

It is an arithmetic number, because the mean of its divisors is an integer number (53087174829744).

Almost surely, 2^{212261742437207} is an apocalyptic number.

212261742437207 is a deficient number, since it is larger than the sum of its proper divisors (86956881769).

212261742437207 is an equidigital number, since it uses as much as digits as its factorization.

212261742437207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86956881768.

The product of its (nonzero) digits is 3161088, while the sum is 50.

Adding to 212261742437207 its reverse (702734247162212), we get a palindrome (914995989599419).

The spelling of 212261742437207 in words is "two hundred twelve trillion, two hundred sixty-one billion, seven hundred forty-two million, four hundred thirty-seven thousand, two hundred seven".