11020212221 has 2 divisors, whose sum is σ = 11020212222. Its totient is φ = 11020212220.

The previous prime is 11020212191. The next prime is 11020212239. The reversal of 11020212221 is 12221202011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10818288121 + 201924100 = 104011^2 + 14210^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020212221 - 2³⁰ = 9946470397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11020212196 and 11020212205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020212241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510106110 + 5510106111.

It is an arithmetic number, because the mean of its divisors is an integer number (5510106111).

Almost surely, 2^11020212221 is an apocalyptic number.

It is an amenable number.

11020212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020212221 is an equidigital number, since it uses as much as digits as its factorization.

11020212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11020212221 its reverse (12221202011), we get a palindrome (23241414232).

The spelling of 11020212221 in words is "eleven billion, twenty million, two hundred twelve thousand, two hundred twenty-one".