211116261 has 8 divisors (see below), whose sum is σ = 282823264. Its totient is φ = 140076720.

The previous prime is 211116253. The next prime is 211116281. The reversal of 211116261 is 162611112.

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

It is not a de Polignac number, because 211116261 - 2³ = 211116253 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 (211116221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166126 + ... + 167391.

It is an arithmetic number, because the mean of its divisors is an integer number (35352908).

Almost surely, 2^211116261 is an apocalyptic number.

It is an amenable number.

211116261 is a deficient number, since it is larger than the sum of its proper divisors (71707003).

211116261 is a wasteful number, since it uses less digits than its factorization.

211116261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333731.

The product of its digits is 144, while the sum is 21.

The square root of 211116261 is about 14529.8403638856. The cubic root of 211116261 is about 595.4435042820.

Adding to 211116261 its reverse (162611112), we get a palindrome (373727373).

It can be divided in two parts, 21111 and 6261, that added together give a palindrome (27372).

The spelling of 211116261 in words is "two hundred eleven million, one hundred sixteen thousand, two hundred sixty-one".