211243123225 has 12 divisors (see below), whose sum is σ = 261998301100. Its totient is φ = 168957835200.

The previous prime is 211243123211. The next prime is 211243123321. The reversal of 211243123225 is 522321342112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 52905980169 + 158337143056 = 230013^2 + 397916^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211243123225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211243123193 and 211243123202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 798750 + ... + 1029799.

Almost surely, 2^211243123225 is an apocalyptic number.

211243123225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211243123225 is a deficient number, since it is larger than the sum of its proper divisors (50755177875).

211243123225 is a wasteful number, since it uses less digits than its factorization.

211243123225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833180 (or 1833175 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

Adding to 211243123225 its reverse (522321342112), we get a palindrome (733564465337).

The spelling of 211243123225 in words is "two hundred eleven billion, two hundred forty-three million, one hundred twenty-three thousand, two hundred twenty-five".