211632505 has 16 divisors (see below), whose sum is σ = 299602944. Its totient is φ = 140437440.

The previous prime is 211632503. The next prime is 211632511. The reversal of 211632505 is 505236112.

211632505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211632505 - 2¹ = 211632503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211632505.

It is not an unprimeable number, because it can be changed into a prime (211632503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96442 + ... + 98611.

It is an arithmetic number, because the mean of its divisors is an integer number (18725184).

Almost surely, 2^211632505 is an apocalyptic number.

It is an amenable number.

211632505 is a deficient number, since it is larger than the sum of its proper divisors (87970439).

211632505 is a wasteful number, since it uses less digits than its factorization.

211632505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195096.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 211632505 is about 14547.5944746889. The cubic root of 211632505 is about 595.9284565340.

Adding to 211632505 its reverse (505236112), we get a palindrome (716868617).

The spelling of 211632505 in words is "two hundred eleven million, six hundred thirty-two thousand, five hundred five".