212120242 has 4 divisors (see below), whose sum is σ = 318180366. Its totient is φ = 106060120.

The previous prime is 212120231. The next prime is 212120243. The reversal of 212120242 is 242021212.

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., 133425601 + 78694641 = 11551^2 + 8871^2 .

It is a super-2 number, since 2×212120242² = 89989994132277128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212120243) 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 as a sum of consecutive naturals, namely, 53030059 + ... + 53030062.

Almost surely, 2^212120242 is an apocalyptic number.

212120242 is a deficient number, since it is larger than the sum of its proper divisors (106060124).

212120242 is a wasteful number, since it uses less digits than its factorization.

212120242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106060123.

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

The square root of 212120242 is about 14564.3483204708. The cubic root of 212120242 is about 596.3859057285.

Adding to 212120242 its reverse (242021212), we get a palindrome (454141454).

The spelling of 212120242 in words is "two hundred twelve million, one hundred twenty thousand, two hundred forty-two".