211424225 has 6 divisors (see below), whose sum is σ = 262166070. Its totient is φ = 169139360.

The previous prime is 211424219. The next prime is 211424263. The reversal of 211424225 is 522424112.

It can be written as a sum of positive squares in 3 ways, for example, as 99856 + 211324369 = 316^2 + 14537^2 .

It is not a de Polignac number, because 211424225 - 2²² = 207229921 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211424225.

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 5 ways as a sum of consecutive naturals, for example, 4228460 + ... + 4228509.

It is an arithmetic number, because the mean of its divisors is an integer number (43694345).

Almost surely, 2^211424225 is an apocalyptic number.

211424225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211424225 is a deficient number, since it is larger than the sum of its proper divisors (50741845).

211424225 is an equidigital number, since it uses as much as digits as its factorization.

211424225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8456979 (or 8456974 counting only the distinct ones).

The product of its digits is 1280, while the sum is 23.

The square root of 211424225 is about 14540.4341406988. The cubic root of 211424225 is about 595.7328962803.

Adding to 211424225 its reverse (522424112), we get a palindrome (733848337).

The spelling of 211424225 in words is "two hundred eleven million, four hundred twenty-four thousand, two hundred twenty-five".