211220102221 has 4 divisors (see below), whose sum is σ = 211300692444. Its totient is φ = 211139512000.

The previous prime is 211220102189. The next prime is 211220102239. The reversal of 211220102221 is 122201022112.

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 160308948996 + 50911153225 = 400386^2 + 225635^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220102221 - 2⁵ = 211220102189 is a prime.

It is a super-2 number, since 2×211220102221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220102195 and 211220102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220103221) 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, 40291180 + ... + 40296421.

It is an arithmetic number, because the mean of its divisors is an integer number (52825173111).

Almost surely, 2^211220102221 is an apocalyptic number.

It is an amenable number.

211220102221 is a deficient number, since it is larger than the sum of its proper divisors (80590223).

211220102221 is an equidigital number, since it uses as much as digits as its factorization.

211220102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80590222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211220102221 its reverse (122201022112), we get a palindrome (333421124333).

The spelling of 211220102221 in words is "two hundred eleven billion, two hundred twenty million, one hundred two thousand, two hundred twenty-one".