211138207 has 6 divisors (see below), whose sum is σ = 245609808. Its totient is φ = 180975564.

The previous prime is 211138201. The next prime is 211138231. The reversal of 211138207 is 702831112.

It is a happy number.

It is not a de Polignac number, because 211138207 - 2³ = 211138199 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 (211138201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2154423 + ... + 2154520.

It is an arithmetic number, because the mean of its divisors is an integer number (40934968).

Almost surely, 2^211138207 is an apocalyptic number.

211138207 is a deficient number, since it is larger than the sum of its proper divisors (34471601).

211138207 is an equidigital number, since it uses as much as digits as its factorization.

211138207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308957 (or 4308950 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 211138207 is about 14530.5955487034. The cubic root of 211138207 is about 595.4641361214.

Adding to 211138207 its reverse (702831112), we get a palindrome (913969319).

The spelling of 211138207 in words is "two hundred eleven million, one hundred thirty-eight thousand, two hundred seven".