211211018 has 8 divisors (see below), whose sum is σ = 317250948. Its totient is φ = 105460704.

The previous prime is 211211017. The next prime is 211211023. The reversal of 211211018 is 810112112.

It can be written as a sum of positive squares in 2 ways, for example, as 168922009 + 42289009 = 12997^2 + 6503^2 .

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

It is a super-2 number, since 2×211211018² = 89220188249192648, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211210987 and 211211005.

It is not an unprimeable number, because it can be changed into a prime (211211017) 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 3 ways as a sum of consecutive naturals, for example, 70571 + ... + 73502.

Almost surely, 2^211211018 is an apocalyptic number.

211211018 is a deficient number, since it is larger than the sum of its proper divisors (106039930).

211211018 is a wasteful number, since it uses less digits than its factorization.

211211018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144808.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 211211018 is about 14533.1007703105. The cubic root of 211211018 is about 595.5325768471.

The spelling of 211211018 in words is "two hundred eleven million, two hundred eleven thousand, eighteen".