211288138 has 8 divisors (see below), whose sum is σ = 335575332. Its totient is φ = 99429696.

The previous prime is 211288117. The next prime is 211288141. The reversal of 211288138 is 831882112.

It can be written as a sum of positive squares in 2 ways, for example, as 210627169 + 660969 = 14513^2 + 813^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 6214357 = 211288138 / (2 + 1 + 1 + 2 + 8 + 8 + 1 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3107145 + ... + 3107212.

Almost surely, 2^211288138 is an apocalyptic number.

211288138 is a deficient number, since it is larger than the sum of its proper divisors (124287194).

211288138 is a wasteful number, since it uses less digits than its factorization.

211288138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6214376.

The product of its digits is 6144, while the sum is 34.

The square root of 211288138 is about 14535.7537816241. The cubic root of 211288138 is about 595.6050507866.

The spelling of 211288138 in words is "two hundred eleven million, two hundred eighty-eight thousand, one hundred thirty-eight".