212040225 has 18 divisors (see below), whose sum is σ = 379788006. Its totient is φ = 113088000.

The previous prime is 212040223. The next prime is 212040263. The reversal of 212040225 is 522040212.

It can be written as a sum of positive squares in 3 ways, for example, as 12552849 + 199487376 = 3543^2 + 14124^2 .

It is not a de Polignac number, because 212040225 - 2¹ = 212040223 is a prime.

It is a super-2 number, since 2×212040225² = 89922114036101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212040198 and 212040207.

It is not an unprimeable number, because it can be changed into a prime (212040221) 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 in 17 ways as a sum of consecutive naturals, for example, 470976 + ... + 471425.

Almost surely, 2^212040225 is an apocalyptic number.

212040225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212040225 is a deficient number, since it is larger than the sum of its proper divisors (167747781).

212040225 is a wasteful number, since it uses less digits than its factorization.

212040225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942417 (or 942409 counting only the distinct ones).

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

The square root of 212040225 is about 14561.6010452148. The cubic root of 212040225 is about 596.3109057940.

Adding to 212040225 its reverse (522040212), we get a palindrome (734080437).

The spelling of 212040225 in words is "two hundred twelve million, forty thousand, two hundred twenty-five".