1211707723106 has 4 divisors (see below), whose sum is σ = 1817561584662. Its totient is φ = 605853861552.

The previous prime is 1211707723043. The next prime is 1211707723133. The reversal of 1211707723106 is 6013277071121.

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

It can be written as a sum of positive squares in only one way, i.e., 831271651081 + 380436072025 = 911741^2 + 616795^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211707723106.

It is an unprimeable number.

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, 302926930775 + ... + 302926930778.

Almost surely, 2^{1211707723106} is an apocalyptic number.

1211707723106 is a deficient number, since it is larger than the sum of its proper divisors (605853861556).

1211707723106 is an equidigital number, since it uses as much as digits as its factorization.

1211707723106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605853861555.

The product of its (nonzero) digits is 24696, while the sum is 38.

The spelling of 1211707723106 in words is "one trillion, two hundred eleven billion, seven hundred seven million, seven hundred twenty-three thousand, one hundred six".