211140242 has 16 divisors (see below), whose sum is σ = 335626200. Its totient is φ = 99442560.

The previous prime is 211140233. The next prime is 211140343. The reversal of 211140242 is 242041112.

It can be written as a sum of positive squares in 4 ways, for example, as 177395761 + 33744481 = 13319^2 + 5809^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211140242.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42017 + ... + 46772.

Almost surely, 2^211140242 is an apocalyptic number.

211140242 is a deficient number, since it is larger than the sum of its proper divisors (124485958).

211140242 is a wasteful number, since it uses less digits than its factorization.

211140242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88861.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211140242 is about 14530.6655731938. The cubic root of 211140242 is about 595.4660491900.

Adding to 211140242 its reverse (242041112), we get a palindrome (453181354).

The spelling of 211140242 in words is "two hundred eleven million, one hundred forty thousand, two hundred forty-two".