212124434 has 4 divisors (see below), whose sum is σ = 318186654. Its totient is φ = 106062216.

The previous prime is 212124433. The next prime is 212124443. The reversal of 212124434 is 434421212.

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., 145130209 + 66994225 = 12047^2 + 8185^2 .

It is not an unprimeable number, because it can be changed into a prime (212124433) by changing a digit.

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 as a sum of consecutive naturals, namely, 53031107 + ... + 53031110.

Almost surely, 2^212124434 is an apocalyptic number.

212124434 is a deficient number, since it is larger than the sum of its proper divisors (106062220).

212124434 is a wasteful number, since it uses less digits than its factorization.

212124434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106062219.

The product of its digits is 1536, while the sum is 23.

The square root of 212124434 is about 14564.4922328243. The cubic root of 212124434 is about 596.3898343702.

Adding to 212124434 its reverse (434421212), we get a palindrome (646545646).

The spelling of 212124434 in words is "two hundred twelve million, one hundred twenty-four thousand, four hundred thirty-four".