211111647851 has 8 divisors (see below), whose sum is σ = 227354764560. Its totient is φ = 194869068192.

The previous prime is 211111647809. The next prime is 211111647863. The reversal of 211111647851 is 158746111112.

211111647851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211111647851 - 2¹⁰ = 211111646827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111547851) 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 in 7 ways as a sum of consecutive naturals, for example, 1107785 + ... + 1284293.

It is an arithmetic number, because the mean of its divisors is an integer number (28419345570).

Almost surely, 2^211111647851 is an apocalyptic number.

211111647851 is a deficient number, since it is larger than the sum of its proper divisors (16243116709).

211111647851 is a wasteful number, since it uses less digits than its factorization.

211111647851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268525.

The product of its digits is 13440, while the sum is 38.

Adding to 211111647851 its reverse (158746111112), we get a palindrome (369857758963).

The spelling of 211111647851 in words is "two hundred eleven billion, one hundred eleven million, six hundred forty-seven thousand, eight hundred fifty-one".