212105252 has 12 divisors (see below), whose sum is σ = 374859996. Its totient is φ = 105002400.

The previous prime is 212105251. The next prime is 212105261. The reversal of 212105252 is 252501212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 183439936 + 28665316 = 13544^2 + 5354^2 .

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (212105251) 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 in 3 ways as a sum of consecutive naturals, for example, 262103 + ... + 262910.

It is an arithmetic number, because the mean of its divisors is an integer number (31238333).

Almost surely, 2^212105252 is an apocalyptic number.

It is an amenable number.

212105252 is a deficient number, since it is larger than the sum of its proper divisors (162754744).

212105252 is a wasteful number, since it uses less digits than its factorization.

212105252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525118 (or 525116 counting only the distinct ones).

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

The square root of 212105252 is about 14563.8336985836. The cubic root of 212105252 is about 596.3718570373.

Adding to 212105252 its reverse (252501212), we get a palindrome (464606464).

It can be divided in two parts, 21210 and 5252, that added together give a palindrome (26462).

The spelling of 212105252 in words is "two hundred twelve million, one hundred five thousand, two hundred fifty-two".