211231242 has 12 divisors (see below), whose sum is σ = 457667730. Its totient is φ = 70410408.

The previous prime is 211231219. The next prime is 211231271. The reversal of 211231242 is 242132112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 194017041 + 17214201 = 13929^2 + 4149^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11735069 = 211231242 / (2 + 1 + 1 + 2 + 3 + 1 + 2 + 4 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5867517 + ... + 5867552.

Almost surely, 2^211231242 is an apocalyptic number.

211231242 is an abundant number, since it is smaller than the sum of its proper divisors (246436488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211231242 is a wasteful number, since it uses less digits than its factorization.

211231242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11735077 (or 11735074 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 211231242 is about 14533.7965446060. The cubic root of 211231242 is about 595.5515841675.

Adding to 211231242 its reverse (242132112), we get a palindrome (453363354).

The spelling of 211231242 in words is "two hundred eleven million, two hundred thirty-one thousand, two hundred forty-two".