211155012225 has 36 divisors (see below), whose sum is σ = 379784620800. Its totient is φ = 112144781280.

The previous prime is 211155012199. The next prime is 211155012227. The reversal of 211155012225 is 522210551112.

211155012225 is a `hidden beast` number, since 2 + 1 + 115 + 501 + 22 + 25 = 666.

It is not a de Polignac number, because 211155012225 - 2⁶ = 211155012161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211155012227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1909545 + ... + 2017094.

It is an arithmetic number, because the mean of its divisors is an integer number (10549572800).

Almost surely, 2^211155012225 is an apocalyptic number.

211155012225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211155012225 is a deficient number, since it is larger than the sum of its proper divisors (168629608575).

211155012225 is a wasteful number, since it uses less digits than its factorization.

211155012225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926894 (or 3926886 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 211155012225 its reverse (522210551112), we get a palindrome (733365563337).

The spelling of 211155012225 in words is "two hundred eleven billion, one hundred fifty-five million, twelve thousand, two hundred twenty-five".