212105450 has 12 divisors (see below), whose sum is σ = 394516230. Its totient is φ = 84842160.

The previous prime is 212105437. The next prime is 212105459. The reversal of 212105450 is 54501212.

212105450 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 125596849 + 86508601 = 11207^2 + 9301^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212105459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2121005 + ... + 2121104.

Almost surely, 2^212105450 is an apocalyptic number.

212105450 is a deficient number, since it is larger than the sum of its proper divisors (182410780).

212105450 is a wasteful number, since it uses less digits than its factorization.

212105450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242121 (or 4242116 counting only the distinct ones).

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

The square root of 212105450 is about 14563.8404962427. The cubic root of 212105450 is about 596.3720426081.

Adding to 212105450 its reverse (54501212), we get a palindrome (266606662).

The spelling of 212105450 in words is "two hundred twelve million, one hundred five thousand, four hundred fifty".