211323210221 has 8 divisors (see below), whose sum is σ = 218757871800. Its totient is φ = 203898392320.

The previous prime is 211323210187. The next prime is 211323210239. The reversal of 211323210221 is 122012323112.

It can be written as a sum of positive squares in 4 ways, for example, as 14973193225 + 196350016996 = 122365^2 + 443114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211323210221 - 2¹⁸ = 211322948077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211323210193 and 211323210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211323210251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2417216 + ... + 2503113.

It is an arithmetic number, because the mean of its divisors is an integer number (27344733975).

Almost surely, 2^211323210221 is an apocalyptic number.

It is an amenable number.

211323210221 is a deficient number, since it is larger than the sum of its proper divisors (7434661579).

211323210221 is a wasteful number, since it uses less digits than its factorization.

211323210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921839.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211323210221 its reverse (122012323112), we get a palindrome (333335533333).

The spelling of 211323210221 in words is "two hundred eleven billion, three hundred twenty-three million, two hundred ten thousand, two hundred twenty-one".