211331202221 has 8 divisors (see below), whose sum is σ = 213745059000. Its totient is φ = 208925982720.

The previous prime is 211331202191. The next prime is 211331202311. The reversal of 211331202221 is 122202133112.

It can be written as a sum of positive squares in 4 ways, for example, as 11812646596 + 199518555625 = 108686^2 + 446675^2 .

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 211331202221 - 2¹⁰ = 211331201197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211331202193 and 211331202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211331207221) 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, 2110100 + ... + 2207981.

It is an arithmetic number, because the mean of its divisors is an integer number (26718132375).

Almost surely, 2^211331202221 is an apocalyptic number.

It is an amenable number.

211331202221 is a deficient number, since it is larger than the sum of its proper divisors (2413856779).

211331202221 is a wasteful number, since it uses less digits than its factorization.

211331202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318639.

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

Adding to 211331202221 its reverse (122202133112), we get a palindrome (333533335333).

The spelling of 211331202221 in words is "two hundred eleven billion, three hundred thirty-one million, two hundred two thousand, two hundred twenty-one".