211111547851 has 2 divisors, whose sum is σ = 211111547852. Its totient is φ = 211111547850.

The previous prime is 211111547849. The next prime is 211111547879. The reversal of 211111547851 is 158745111112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211111547851 - 2¹ = 211111547849 is a prime.

Together with 211111547849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 211111547851.

It is not a weakly prime, because it can be changed into another prime (211111547821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555773925 + 105555773926.

It is an arithmetic number, because the mean of its divisors is an integer number (105555773926).

Almost surely, 2^211111547851 is an apocalyptic number.

211111547851 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111547851 is an equidigital number, since it uses as much as digits as its factorization.

211111547851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11200, while the sum is 37.

Adding to 211111547851 its reverse (158745111112), we get a palindrome (369856658963).

The spelling of 211111547851 in words is "two hundred eleven billion, one hundred eleven million, five hundred forty-seven thousand, eight hundred fifty-one".