212440042 has 4 divisors (see below), whose sum is σ = 318660066. Its totient is φ = 106220020.

The previous prime is 212440027. The next prime is 212440043. The reversal of 212440042 is 240044212.

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., 181737361 + 30702681 = 13481^2 + 5541^2 .

It is not an unprimeable number, because it can be changed into a prime (212440043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53110009 + ... + 53110012.

Almost surely, 2^212440042 is an apocalyptic number.

212440042 is a deficient number, since it is larger than the sum of its proper divisors (106220024).

212440042 is a wasteful number, since it uses less digits than its factorization.

212440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106220023.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 212440042 is about 14575.3230495931. The cubic root of 212440042 is about 596.6854660840.

Adding to 212440042 its reverse (240044212), we get a palindrome (452484254).

The spelling of 212440042 in words is "two hundred twelve million, four hundred forty thousand, forty-two".