211130302221 has 20 divisors (see below), whose sum is σ = 326267775900. Its totient is φ = 135899963136.

The previous prime is 211130302169. The next prime is 211130302237. The reversal of 211130302221 is 122203031112.

211130302221 is a `hidden beast` number, since 2 + 11 + 130 + 302 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 168945660900 + 42184641321 = 411030^2 + 205389^2 .

It is not a de Polignac number, because 211130302221 - 2⁶ = 211130302157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211130302194 and 211130302203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211130302121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44938116 + ... + 44942813.

It is an arithmetic number, because the mean of its divisors is an integer number (16313388795).

Almost surely, 2^211130302221 is an apocalyptic number.

It is an amenable number.

211130302221 is a deficient number, since it is larger than the sum of its proper divisors (115137473679).

211130302221 is an equidigital number, since it uses as much as digits as its factorization.

211130302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89880970 (or 89880961 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211130302221 its reverse (122203031112), we get a palindrome (333333333333).

It can be divided in two parts, 21113030 and 2221, that added together give a triangular number (21115251 = T₆₄₉₈).

The spelling of 211130302221 in words is "two hundred eleven billion, one hundred thirty million, three hundred two thousand, two hundred twenty-one".