221101211101 has 2 divisors, whose sum is σ = 221101211102. Its totient is φ = 221101211100.

The previous prime is 221101211087. The next prime is 221101211141. The reversal of 221101211101 is 101112101122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158475648100 + 62625563001 = 398090^2 + 250251^2 .

It is a cyclic number.

It is not a de Polignac number, because 221101211101 - 2¹¹ = 221101209053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221101211141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550605550 + 110550605551.

It is an arithmetic number, because the mean of its divisors is an integer number (110550605551).

Almost surely, 2^221101211101 is an apocalyptic number.

It is an amenable number.

221101211101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221101211101 is an equidigital number, since it uses as much as digits as its factorization.

221101211101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221101211101 its reverse (101112101122), we get a palindrome (322213312223).

The spelling of 221101211101 in words is "two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred one".