211240042 has 16 divisors (see below), whose sum is σ = 344427552. Its totient is φ = 96582960.

The previous prime is 211240039. The next prime is 211240049. The reversal of 211240042 is 240042112.

It is a junction number, because it is equal to n+sod(n) for n = 211239998 and 211240025.

It is not an unprimeable number, because it can be changed into a prime (211240049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35184 + ... + 40747.

It is an arithmetic number, because the mean of its divisors is an integer number (21526722).

Almost surely, 2^211240042 is an apocalyptic number.

211240042 is a deficient number, since it is larger than the sum of its proper divisors (133187510).

211240042 is a wasteful number, since it uses less digits than its factorization.

211240042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76053.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 211240042 is about 14534.0992840974. The cubic root of 211240042 is about 595.5598543790.

Adding to 211240042 its reverse (240042112), we get a palindrome (451282154).

The spelling of 211240042 in words is "two hundred eleven million, two hundred forty thousand, forty-two".