212105522 has 4 divisors (see below), whose sum is σ = 318158286. Its totient is φ = 106052760.

The previous prime is 212105519. The next prime is 212105527. The reversal of 212105522 is 225501212.

It is a happy number.

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., 198274561 + 13830961 = 14081^2 + 3719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212105494 and 212105503.

It is not an unprimeable number, because it can be changed into a prime (212105527) 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, 53026379 + ... + 53026382.

Almost surely, 2^212105522 is an apocalyptic number.

212105522 is a deficient number, since it is larger than the sum of its proper divisors (106052764).

212105522 is a wasteful number, since it uses less digits than its factorization.

212105522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106052763.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212105522 is about 14563.8429681180. The cubic root of 212105522 is about 596.3721100883.

Adding to 212105522 its reverse (225501212), we get a palindrome (437606734).

The spelling of 212105522 in words is "two hundred twelve million, one hundred five thousand, five hundred twenty-two".