211640027 has 4 divisors (see below), whose sum is σ = 211848336. Its totient is φ = 211431720.

The previous prime is 211640003. The next prime is 211640041. The reversal of 211640027 is 720046112.

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

It is a cyclic number.

It is not a de Polignac number, because 211640027 - 2¹⁸ = 211377883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211639984 and 211640011.

It is not an unprimeable number, because it can be changed into a prime (211640087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102623 + ... + 104664.

It is an arithmetic number, because the mean of its divisors is an integer number (52962084).

Almost surely, 2^211640027 is an apocalyptic number.

211640027 is a deficient number, since it is larger than the sum of its proper divisors (208309).

211640027 is a wasteful number, since it uses less digits than its factorization.

211640027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208308.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 211640027 is about 14547.8530031067. The cubic root of 211640027 is about 595.9355167613.

Adding to 211640027 its reverse (720046112), we get a palindrome (931686139).

The spelling of 211640027 in words is "two hundred eleven million, six hundred forty thousand, twenty-seven".