111102020221 has 2 divisors, whose sum is σ = 111102020222. Its totient is φ = 111102020220.

The previous prime is 111102020219. The next prime is 111102020279. The reversal of 111102020221 is 122020201111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65042851225 + 46059168996 = 255035^2 + 214614^2 .

It is an emirp because it is prime and its reverse (122020201111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111102020221 - 2¹ = 111102020219 is a prime.

Together with 111102020219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111102020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551010110 + 55551010111.

It is an arithmetic number, because the mean of its divisors is an integer number (55551010111).

Almost surely, 2^111102020221 is an apocalyptic number.

It is an amenable number.

111102020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111102020221 is an equidigital number, since it uses as much as digits as its factorization.

111102020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111102020221 its reverse (122020201111), we get a palindrome (233122221332).

The spelling of 111102020221 in words is "one hundred eleven billion, one hundred two million, twenty thousand, two hundred twenty-one".