212400225 has 36 divisors (see below), whose sum is σ = 394533776. Its totient is φ = 113276880.

The previous prime is 212400211. The next prime is 212400229. The reversal of 212400225 is 522004212.

It is not a de Polignac number, because 212400225 - 2⁹ = 212399713 is a prime.

It is a super-2 number, since 2×212400225² = 90227711160101250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212400198 and 212400207.

It is not an unprimeable number, because it can be changed into a prime (212400229) 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 35 ways as a sum of consecutive naturals, for example, 11407 + ... + 23556.

Almost surely, 2^212400225 is an apocalyptic number.

212400225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212400225 is a deficient number, since it is larger than the sum of its proper divisors (182133551).

212400225 is an equidigital number, since it uses as much as digits as its factorization.

212400225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34988 (or 34971 counting only the distinct ones).

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

The square root of 212400225 is about 14573.9570810401. The cubic root of 212400225 is about 596.6481854323.

Adding to 212400225 its reverse (522004212), we get a palindrome (734404437).

The spelling of 212400225 in words is "two hundred twelve million, four hundred thousand, two hundred twenty-five".