212340242 has 4 divisors (see below), whose sum is σ = 318510366. Its totient is φ = 106170120.

The previous prime is 212340241. The next prime is 212340253. The reversal of 212340242 is 242043212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 211149961 + 1190281 = 14531^2 + 1091^2 .

It is not an unprimeable number, because it can be changed into a prime (212340241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53085059 + ... + 53085062.

Almost surely, 2^212340242 is an apocalyptic number.

212340242 is a deficient number, since it is larger than the sum of its proper divisors (106170124).

212340242 is a wasteful number, since it uses less digits than its factorization.

212340242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106170123.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 212340242 is about 14571.8990526287. The cubic root of 212340242 is about 596.5920145602.

Adding to 212340242 its reverse (242043212), we get a palindrome (454383454).

The spelling of 212340242 in words is "two hundred twelve million, three hundred forty thousand, two hundred forty-two".