211031112230221 has 4 divisors (see below), whose sum is σ = 211090440631932. Its totient is φ = 210971783828512.

The previous prime is 211031112230201. The next prime is 211031112230251. The reversal of 211031112230221 is 122032211130112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13432144370121 + 197598967860100 = 3664989^2 + 14056990^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211031112230221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211031112230192 and 211031112230201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211031112230201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29664195520 + ... + 29664202633.

It is an arithmetic number, because the mean of its divisors is an integer number (52772610157983).

Almost surely, 2^{211031112230221} is an apocalyptic number.

It is an amenable number.

211031112230221 is a deficient number, since it is larger than the sum of its proper divisors (59328401711).

211031112230221 is an equidigital number, since it uses as much as digits as its factorization.

211031112230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59328401710.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 211031112230221 its reverse (122032211130112), we get a palindrome (333063323360333).

It can be divided in two parts, 21103111 and 2230221, that added together give a palindrome (23333332).

The spelling of 211031112230221 in words is "two hundred eleven trillion, thirty-one billion, one hundred twelve million, two hundred thirty thousand, two hundred twenty-one".