212240025 has 18 divisors (see below), whose sum is σ = 380145870. Its totient is φ = 113194560.

The previous prime is 212240003. The next prime is 212240069. The reversal of 212240025 is 520042212.

It can be written as a sum of positive squares in 3 ways, for example, as 19474569 + 192765456 = 4413^2 + 13884^2 .

It is not a de Polignac number, because 212240025 - 2⁷ = 212239897 is a prime.

It is an unprimeable number.

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 in 17 ways as a sum of consecutive naturals, for example, 471420 + ... + 471869.

It is an arithmetic number, because the mean of its divisors is an integer number (21119215).

Almost surely, 2^212240025 is an apocalyptic number.

212240025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212240025 is a deficient number, since it is larger than the sum of its proper divisors (167905845).

212240025 is a wasteful number, since it uses less digits than its factorization.

212240025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943305 (or 943297 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 212240025 is about 14568.4599391974. The cubic root of 212240025 is about 596.4981430926.

Adding to 212240025 its reverse (520042212), we get a palindrome (732282237).

The spelling of 212240025 in words is "two hundred twelve million, two hundred forty thousand, twenty-five".