1100202221 has 2 divisors, whose sum is σ = 1100202222. Its totient is φ = 1100202220.

The previous prime is 1100202197. The next prime is 1100202223. The reversal of 1100202221 is 1222020011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020099721 + 80102500 = 31939^2 + 8950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100202221 - 2²² = 1096007917 is a prime.

Together with 1100202223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100202223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550101110 + 550101111.

It is an arithmetic number, because the mean of its divisors is an integer number (550101111).

Almost surely, 2^1100202221 is an apocalyptic number.

It is an amenable number.

1100202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100202221 is an equidigital number, since it uses as much as digits as its factorization.

1100202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1100202221 is about 33169.2963597361. The cubic root of 1100202221 is about 1032.3433687675.

Adding to 1100202221 its reverse (1222020011), we get a palindrome (2322222232).

The spelling of 1100202221 in words is "one billion, one hundred million, two hundred two thousand, two hundred twenty-one".